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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Sale of private placement warrants (in Shares)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_lbl" xlink:role="http://www.xbrl.org/2009/role/netLabel">Agreed to purchase</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TemporaryEquityAccretionToRedemptionValue_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Accretion for Class A ordinary shares to redemption amount</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TemporaryEquityAccretionToRedemptionValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Temporary Equity, Accretion to Redemption Value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted average shares outstanding (in Shares)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Basic weighted average ordinary shares outstanding</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Weighted Average Number of Shares Outstanding, Basic</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_DeferredOfferingCostsPaidBySponsorInExchangeForIssuanceOfClassBOrdinaryShares_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred offering costs paid by Sponsor in exchange for issuance of Class B ordinary shares</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_DeferredOfferingCostsPaidBySponsorInExchangeForIssuanceOfClassBOrdinaryShares_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Deferred offering costs paid by Sponsor in exchange for issuance of Class B ordinary shares.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_DeferredOfferingCostPaidThroughAdvanceFromRelatedParty_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred offering cost paid through advance from related party</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_DeferredOfferingCostPaidThroughAdvanceFromRelatedParty_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Deferred offering cost paid through advance from related party.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_PrepaidExpensesPaidByAdvanceFromRelatedParty_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Prepaid expenses paid by advance from related party</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_PrepaidExpensesPaidByAdvanceFromRelatedParty_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Prepaid expenses paid by advance from related party.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_AdjustmentsToAdditionalPaidInCapitalFormerSponsorContribution_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Former Sponsor Contribution</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_AdjustmentsToAdditionalPaidInCapitalFormerSponsorContribution_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Adjustments to additional paid in capital  former sponsor contribution.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Issuance of Class B ordinary shares to Sponsor</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock Issued During Period, Value, New Issues</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Issuance of Class B ordinary shares to Sponsor (in Shares)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/disclosureGuidance">Shares issued</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock Issued During Period, Shares, New Issues</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Changes in operating assets and liabilities:</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInOtherCurrentAssets_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Other assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInOtherCurrentAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (Decrease) in Other Current Assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_AdjustmentstoAdditionalPaidInCapitalTransactionCoststoClassAShares_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Allocated value of transaction costs to Class A shares</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_AdjustmentstoAdditionalPaidInCapitalTransactionCoststoClassAShares_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Adjustmentsto Additional Paid In Capital Transaction Coststo Class AShares</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_AdjustmentstoAdditionalPaidInCapitalTransactionCoststoClassAShares_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The amount of allocated value of transaction costs to class A shares</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdditionalPaidInCapitalMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Additional Paid-in Capital</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdditionalPaidInCapitalMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Additional Paid-in Capital [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalMarkToMarket_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value of Public Warrants at issuance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalMarkToMarket_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Adjustments to Additional Paid in Capital, Fair Value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Sale of 8,337,500 Private Placement Warrants</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Adjustments to Additional Paid in Capital, Warrant Issued</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Ordinary Shares</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquityComponentDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity Component [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetainedEarningsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accumulated Deficit</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetainedEarningsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Retained Earnings [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementEquityComponentsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity Components [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Cash &#8211; End of period</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Cash &#8211; Beginning of period</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Adjustments to reconcile net income to net cash used in operating activities:</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_FormationCostsPaidBySponsorInExchangeForIssuanceOfClassBOrdinaryShares_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Formation costs paid by Sponsor in exchange for issuance of Class B ordinary shares</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_FormationCostsPaidBySponsorInExchangeForIssuanceOfClassBOrdinaryShares_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Formation Costs Paid By Sponsor In Exchange For Issuance Of Class BOrdinary Shares</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_FormationCostsPaidBySponsorInExchangeForIssuanceOfClassBOrdinaryShares_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Formation costs paid by Sponsor in exchange for issuance of Class B ordinary shares.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInAccruedLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accrued expenses</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInAccruedLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (Decrease) in Accrued Liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_PaymentOfOperationCostsThroughPromissoryNote_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Payment of operation costs through promissory note</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_PaymentOfOperationCostsThroughPromissoryNote_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payment of operation costs through promissory note</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_PaymentOfOperationCostsThroughPromissoryNote_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The amount of payment of operation costs through promissory note.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_PaymentOfOperationCostsThroughAdvanceFromRelatedParty_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Payment of operation costs through advance from related party</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_PaymentOfOperationCostsThroughAdvanceFromRelatedParty_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payment of operation costs through advance from related party</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_PaymentOfOperationCostsThroughAdvanceFromRelatedParty_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The amount of payment of operation costs through advance from related party.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInDueFromRelatedParties_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Due from related party</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInDueFromRelatedParties_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (Decrease) in Due from Related Parties</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RepaymentsOfRelatedPartyDebt_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Repayment of advances from related party</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RepaymentsOfRelatedPartyDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Repayments of Related Party Debt</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromNotesPayable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Proceeds from promissory note &#8211; related party</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromNotesPayable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proceeds from Notes Payable</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net cash provided by financing activities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash Provided by (Used in) Financing Activity, Including Discontinued Operation</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Description of Organization and Business Operations [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">DESCRIPTION OF ORGANIZATION AND BUSINESS OPERATIONS</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">COMMITMENTS AND CONTINGENCIES</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Commitments and Contingencies Disclosure [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityNoteAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Shareholders&#8217; Deficit [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityNoteDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">SHAREHOLDERS&#8217; DEFICIT</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityNoteDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueDisclosuresAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value Measurements [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueDisclosuresTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">FAIR VALUE MEASUREMENTS</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueDisclosuresTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value Disclosures [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentReportingAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Segment Information [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Related Party Transactions [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementsFairValueHierarchyDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value Hierarchy and NAV [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Fair value of Public Warrants for Class A ordinary shares subject to redemption allocation</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accretion for Class A ordinary shares to redemption amount</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Temporary Equity, Accretion to Redemption Value, Adjustment</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_ProbabilityOfCompletionABusinessCombinationMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Probability of completion a Business Combination [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_ScheduleOfRegardingMarketAssumptionsUsedInTheValuationOfThePublicWarrantsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Regarding Market Assumptions Used in the Valuation of the Public Warrants [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_TermYearsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Term (years) [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_UnderlyingStockPriceMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Underlying stock price [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Regarding Market Assumptions Used in the Valuation of the Public Warrants [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value Measurement Inputs and Valuation Techniques [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value Measurement Inputs and Valuation Techniques [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MeasurementInputExercisePriceMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Exercise price [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MeasurementInputExercisePriceMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Measurement Input, Exercise Price [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MeasurementInputPriceVolatilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Volatility [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MeasurementInputPriceVolatilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Measurement Input, Price Volatility [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MeasurementInputRiskFreeInterestRateMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Risk-free rate [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MeasurementInputRiskFreeInterestRateMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Measurement Input, Risk Free Interest Rate [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MeasurementInputTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Measurement Input Type [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MeasurementInputTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Measurement Input Type [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WarrantsAndRightsOutstandingMeasurementInput_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Warrants and Rights Outstanding, Measurement Input</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_SponsorMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Sponsor [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_SponsorMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Sponsor Member</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_SubsequentEventsDetailsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Subsequent Events (Details) [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentAnnualPrincipalPayment_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Aggregate principal amount</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentAnnualPrincipalPayment_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Instrument, Annual Principal Payment</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Related and Nonrelated Parties [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Related and Nonrelated Parties [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SecuritiesBorrowed_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Borrowed amount</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SecuritiesBorrowed_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Securities Borrowed</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Subsequent Events [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Subsequent Event [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Subsequent Event [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Subsequent Events [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Subsequent Event Type [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Subsequent Event Type [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_ScheduleOfAssetsMeasuredAtFairValueAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Assets Measured at Fair Value [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_ScheduleOfAssetsMeasuredAtFairValueTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Assets Measured at Fair Value [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Equity:</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Assets Measured at Fair Value [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity Securities without Readily Determinable Fair Value [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByFairValueHierarchyLevelAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value Hierarchy and NAV [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueInputsLevel3Member_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Leval 3 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueInputsLevel3Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Significant Other Unobservable Inputs [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueInputsLevel3Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value, Inputs, Level 3 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_ConvertiblePromissoryNoteRelatedPartyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Convertible Promissory Note &#8211; Related Party</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_ConvertiblePromissoryNoteRelatedPartyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Convertible Promissory Note Related Party Policy Text Block</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_ConvertiblePromissoryNoteRelatedPartyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure of accounting policy for convertible promissory note &#8211; related party.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Regarding Market Assumptions Used in the Valuation of the Public Warrants</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_PublicSharesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Public Shares [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_PublicSharesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Public Shares Member</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_ConvertiblePromissoryNoteMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Convertible Promissory Note [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_ConvertiblePromissoryNoteMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Convertible Promissory Note Member</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountingPoliciesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Significant Accounting Policies [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BasisOfAccountingPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Basis of Presentation</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BasisOfAccountingPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Basis of Accounting, Policy [Policy Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_EmergingGrowthCompanyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Emerging Growth Company</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_EmergingGrowthCompanyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Emerging Growth Company Policy Text Block</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_EmergingGrowthCompanyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure of accounting policy for emerging growth company.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_DeferredOfferingCostsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Offering Costs</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_DeferredOfferingCostsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Offering Costs Policy Text Block</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_DeferredOfferingCostsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure of accounting policy for deferred offering costs.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_WarrantInstrumentsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Warrant Instruments</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_WarrantInstrumentsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Warrant Instruments Policy Text Block</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_WarrantInstrumentsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure of accounting policy for warrant instruments.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TemporaryEquityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Class A Ordinary Shares Subject to Redemption Reflected in the Balance Sheet</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TemporaryEquityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Temporary Equity [Table Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RangeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statistical Measurement [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RangeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statistical Measurement [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MaximumMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Maximum [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MaximumMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Maximum [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MinimumMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Minimum [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MinimumMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Minimum [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_M3BrigadeAcquisitionVCorpMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">M3-Brigade Acquisition V Corp [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_M3BrigadeAcquisitionVCorpMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">M3 Brigade Acquisition VCorp Member</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_UnderwritingAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Underwriting Agreement [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_UnderwritingAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Underwriting Agreement Member</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_EquityPIPESubscriptionAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Equity PIPE Subscription Agreement [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_EquityPIPESubscriptionAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity PIPESubscription Agreement Member</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_ConvertibleNoteSubscriptionAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Convertible Note Subscription Agreement [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_ConvertibleNoteSubscriptionAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Convertible Note Subscription Agreement Member</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_PrivatePlacementWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Private Placement Warrants [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_PrivatePlacementWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Private Placement Warrants Member</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ArrangementsAndNonarrangementTransactionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Collaborative Arrangement and Arrangement Other than Collaborative [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_PromissoryNoteMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Promissory Note [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_PromissoryNoteMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Promissory Note Member</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionContingentConsiderationLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Description of Organization and Business Operations [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityIncorporationDateOfIncorporation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Incorporation date</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityIncorporationDateOfIncorporation_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Incorporation, Date of Incorporation</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_UnitsIssuedDuringPeriodSharesNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of units issued (in Shares)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_UnitsIssuedDuringPeriodSharesNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Units Issued During Period Shares New Issues</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_UnitsIssuedDuringPeriodSharesNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Number of units issued.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_TransactionCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Transaction costs</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_TransactionCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Transaction Costs</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_TransactionCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The amount of expenses related to transaction costs.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_PIPEInvestorMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">PIPE Investor [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_MinimumPercentageOfFairMarketValueOfBusinessAcquisitionToTrustAccountBalance_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Percentage of fair market value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_MinimumPercentageOfFairMarketValueOfBusinessAcquisitionToTrustAccountBalance_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Minimum Percentage Of Fair Market Value Of Business Acquisition To Trust Account Balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_MinimumPercentageOfFairMarketValueOfBusinessAcquisitionToTrustAccountBalance_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Minimum percentage of fair market value of business acquisition to trust account balance.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_NoOfMaturityDays_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Maturity days</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_NoOfMaturityDays_lbl" xlink:role="http://www.xbrl.org/2003/role/label">No Of Maturity Days</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_NoOfMaturityDays_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">No of maturity days.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_InitialBusinessCombinationOrToRedeemPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Initial business combination or to redeem percentage</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_InitialBusinessCombinationOrToRedeemPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Initial Business Combination Or To Redeem Percentage</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_InitialBusinessCombinationOrToRedeemPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Initial Business Combination or to redeem percentage.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_MaximumNetInterestToPayDissolutionExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Maximum net interest to pay dissolution expenses</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_MaximumNetInterestToPayDissolutionExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Maximum Net Interest To Pay Dissolution Expenses</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_MaximumNetInterestToPayDissolutionExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Represents the maximum net interest to pay dissolution expenses.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharesSubjectToMandatoryRedemptionChangesInRedemptionValuePolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Class A Shares Subject to Possible Redemption</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharesSubjectToMandatoryRedemptionChangesInRedemptionValuePolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Shares Subject to Mandatory Redemption, Changes in Redemption Value, Policy [Policy Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerSharePolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net Income per Ordinary Share</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerSharePolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Earnings Per Share, Policy [Policy Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConcentrationRiskCreditRisk_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Concentration of Credit Risk</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConcentrationRiskCreditRisk_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Concentration Risk, Credit Risk, Policy [Policy Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Recent Accounting Pronouncements</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">New Accounting Pronouncements, Policy [Policy Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Class of Warrant or Right [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Class of Warrant or Right [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Price per warrants (in Dollars per share)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Price per warrant (in Dollars per share)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Class of Warrant or Right, Exercise Price of Warrants or Rights</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Purchase of each warrants (in Shares)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Number of shares of common stock converted</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight_lbl" xlink:role="http://www.xbrl.org/2009/role/netLabel">Purchase of each warrants</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Class of Warrant or Right, Number of Securities Called by Each Warrant or Right</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_lbl" xlink:role="http://www.xbrl.org/2009/role/netLabel">Owned purchase price (in Shares)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Private placement warrants (in Shares)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Aggregate warrants</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Class of Warrant or Right, Number of Securities Called by Warrants or Rights</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Par value (in Dollars per share)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Ordinary shares, par value (in Dollars per share)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare_lbl" xlink:role="http://www.xbrl.org/2009/role/netLabel">Ordinary shares, par value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock, Par or Stated Value Per Share</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtConversionConvertedInstrumentAmount1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Convertible loans</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtConversionConvertedInstrumentAmount1_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Convertible loans (in Dollars)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtConversionConvertedInstrumentAmount1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Conversion, Converted Instrument, Amount</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Instrument [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentConvertibleConversionPrice1_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Warrant price (in Dollars per share)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentConvertibleConversionPrice1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Aggregate purchase price (in Dollars per share)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentConvertibleConversionPrice1_lbl" xlink:role="http://www.xbrl.org/2009/role/netLabel">Aggregate purchase price</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentConvertibleConversionPrice1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Instrument, Convertible, Conversion Price</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentFaceAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Aggregate loan expenses</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentFaceAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Aggregate principal amount</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentFaceAmount_lbl" xlink:role="http://www.xbrl.org/2009/role/netLabel">Aggregate principal amount (in Dollars)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentFaceAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Instrument, Face Amount</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentIncreaseAccruedInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Unpaid principal balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentIncreaseAccruedInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Instrument, Increase, Accrued Interest</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Instrument, Name [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IPOMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Initial Public Offering [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IPOMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">IPO [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NotesPayableCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Outstanding balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NotesPayableCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Notes Payable, Current</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherBorrowings_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Borrowings</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherBorrowings_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Borrowings</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Advance from related party</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherReceivablesNetCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Due from related party</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherReceivablesNetCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Receivables, Net, Current</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PlanNameAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Plan Name [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PlanNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Plan Name [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromContributionsFromAffiliates_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Capital contribution</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromContributionsFromAffiliates_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proceeds from Contributions from Affiliates</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Related Party [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Related Party</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Related Party [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityWellKnownSeasonedIssuer_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Well-known Seasoned Issuer</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_IcfrAuditorAttestationFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">ICFR Auditor Attestation Flag</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_LocalPhoneNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Local Phone Number</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_Security12bTitle_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Title of 12(b) Security</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_AccruedOfferingCostsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accrued offering costs</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_AccruedOfferingCostsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accrued Offering Costs Current</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_AccruedOfferingCostsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Represents the amount of accrued offering costs.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_DeferredUnderwritingFeeNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deferred underwriting fee payable</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_DeferredUnderwritingFeeNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Underwriting Fee Noncurrent</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_DeferredUnderwritingFeeNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Amount of deferred underwriting fee, Noncurrent.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccruedLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accrued expenses</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccruedLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Accrued compensation</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccruedLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accrued Liabilities, Current</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdditionalPaidInCapital_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Additional paid-in capital</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdditionalPaidInCapital_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Additional Paid in Capital</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Assets_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total Assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Assets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Assets:</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Assets [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfStockLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Shareholders&#8217; Deficit [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfStockLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Private Placement [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfStockLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Initial Public Offering [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentInformationLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Information [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentInformationTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Information [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentPeriodEndDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Period End Date</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentsIncorporatedByReferenceTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Documents Incorporated by Reference [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentTransitionReport_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Transition Report</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentType_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Type</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressAddressLine1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Address, Address Line One</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressAddressLine2_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Address, Address Line Two</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressCityOrTown_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Address, City or Town</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressPostalZipCode_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Address, Postal Zip Code</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_RedemptionPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Redemption percentage</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_RedemptionPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Redemption Percentage</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_RedemptionPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Redemption percentage.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Related Party Transaction [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Related Party Transaction [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Related Party Transactions [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SaleOfStockNameOfTransactionDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Sale of Stock [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharesIssuedPricePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Share price (in Dollars per share)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharesIssuedPricePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Purchase price per unit (in Dollars per share)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharesIssuedPricePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share price</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsidiarySaleOfStockAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Sale of Stock [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_DeferredUnderwritingFee_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Underwriting expenses (in Dollars)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_DeferredUnderwritingFee_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Underwriting Fee</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_DeferredUnderwritingFee_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Represents the amount of deferred underwriting fee.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_InitialConvertibleSubscriptionsPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Initial convertible subscriptions rate of percentage</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_InitialConvertibleSubscriptionsPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Initial Convertible Subscriptions Percentage</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_InitialConvertibleSubscriptionsPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Initial convertible and such subscriptions, including the purchase of any option convertible notes.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_PercentageOfDeferredUnderwritingDiscount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Percentage of deferred underwriting discount</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_PercentageOfDeferredUnderwritingDiscount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Percentage Of Deferred Underwriting Discount</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_PercentageOfDeferredUnderwritingDiscount_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Percentage of deferred underwriting discount.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_PercentageOfGrossProceedsSoldToUnderwriters_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Percentage of gross proceeds sold to underwriters</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_PercentageOfGrossProceedsSoldToUnderwriters_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Percentage Of Gross Proceeds Sold To Underwriters</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_PercentageOfGrossProceedsSoldToUnderwriters_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Percentage of gross proceeds sold to underwriters.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Warrants outstanding</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Class of Warrant or Right, Outstanding</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PublicUtilitiesRequestedEquityCapitalStructurePercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Percentage of capital utilized</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PublicUtilitiesRequestedEquityCapitalStructurePercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Public Utilities, Requested Equity Capital Structure, Percentage</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_SignificantAccountingPoliciesScheduleofBasicandDilutedNetIncomePerOrdinaryShareDetailsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Basic and Diluted Net Income Per Ordinary Share [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Numerator:</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Net Income (Loss) Available to Common Stockholders, Basic [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OverAllotmentOptionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Over-Allotment Option [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OverAllotmentOptionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Over-Allotment Option [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Cash_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Cash_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash equivalents</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash and Cash Equivalent</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsHeldInTrustNoncurrent_lbl" xlink:role="http://www.xbrl.org/2009/role/netLabel">Asset held trust</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsHeldInTrustNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Investments held in Trust Account</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsHeldInTrustNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Investments held in Trust Account &#8211; mutual funds</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsHeldInTrustNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Asset, Held-in-Trust, Noncurrent</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Percentage of voting securities acquired</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Voting Equity Interest Acquired, Percentage</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TypeOfArrangementAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Collaborative Arrangement and Arrangement Other than Collaborative [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromIssuanceInitialPublicOffering_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Gross proceeds</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromIssuanceInitialPublicOffering_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proceeds from Issuance Initial Public Offering</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SaleOfStockPricePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Sale of stock price per shate (in Dollars per share)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SaleOfStockPricePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Sale of Stock, Price Per Share</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromIssuanceOfWarrants_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Purchase of warrants</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromIssuanceOfWarrants_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Proceeds allocated to Public Warrants</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromIssuanceOfWarrants_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Gross proceeds of warrants (in Dollars)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromIssuanceOfWarrants_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proceeds from Issuance of Warrants</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Significant Accounting Policies [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsForUnderwritingExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash underwriting fee</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsForUnderwritingExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payments for Underwriting Expense</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherUnderwritingExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deferred underwriting fee</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherUnderwritingExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Underwriting Expense</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredOfferingCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other offering costs</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredOfferingCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Offering Costs</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Per share (in Dollars per share)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share Price</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_WarrantExercisableTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Warrant exercisable term</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_WarrantExercisableTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Warrant Exercisable Term</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_WarrantExercisableTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Warrant exercisable term.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionAcquireeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_RedeemableWarrantMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Redeemable Warrant [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_RedeemableWarrantMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Redeemable Warrant Member</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromIssuanceOrSaleOfEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Less:</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromIssuanceOrSaleOfEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proceeds from Issuance or Sale of Equity [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TemporaryEquityNumberOfSharesRedemptionValueAndOtherDisclosuresAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Plus:</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TemporaryEquityNumberOfSharesRedemptionValueAndOtherDisclosuresAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Temporary Equity, Other Disclosure [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Basic allocation of net income</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Net Income (Loss) Available to Common Stockholders, Basic, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_SaleOfStockUnits_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Sale of stock units</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_SaleOfStockUnits_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Sale Of Stock Units</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_SaleOfStockUnits_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Sale of stock units.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentReportingInformationLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Segment Information [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentReportingInformationLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Segment Reporting Information [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentReportingInformationRevenueAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Company's Performance and Making Key Decisions Regarding Resource Allocation [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AmendmentFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Amendment Flag</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CityAreaCode_lbl" xlink:role="http://www.xbrl.org/2003/role/label">City Area Code</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CoverAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cover [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CurrentFiscalYearEndDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Current Fiscal Year End Date</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentAnnualReport_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Annual Report</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentFinStmtErrorCorrectionFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Financial Statement Error Correction [Flag]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentFiscalPeriodFocus_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Fiscal Period Focus</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentFiscalYearFocus_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Fiscal Year Focus</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_UnitsEachConsistingOfOneClassAOrdinaryShare00001ParValuePerShareAndOnehalfOfOneRedeemableWarrantAbstractMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Units, each consisting of one Class A ordinary share, $0.0001 par value per share and one-half of one redeemable warrant</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_UnitsEachConsistingOfOneClassAOrdinaryShare00001ParValuePerShareAndOnehalfOfOneRedeemableWarrantAbstractMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Units, each consisting of one Class A ordinary share, $0.0001 par value per share and one-half of one redeemable warrant [Abstract] [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_WarrantsEachWholeWarrantExercisableForOneClassAOrdinaryShareEachAtAnExercisePriceOf1150PerShareMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Warrants, each whole warrant exercisable for one Class A ordinary share, each at an exercise price of $11.50 per share</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_WarrantsEachWholeWarrantExercisableForOneClassAOrdinaryShareEachAtAnExercisePriceOf1150PerShareMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Warrants, each whole warrant exercisable for one Class A ordinary share, each at an exercise price of $11.50 per share [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AuditorFirmId_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Auditor Firm ID</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AuditorLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Auditor [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AuditorLocation_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Auditor Location</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AuditorName_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Auditor Name</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AuditorOpinionTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Auditor Opinion [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityFileNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity File Number</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityFilerCategory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Filer Category</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityIncorporationStateCountryCode_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Incorporation, State or Country Code</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityInteractiveDataCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Interactive Data Current</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityPublicFloat_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Public Float</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total current assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Assets, Current</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsCurrentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Current assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsCurrentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Assets, Current [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liabilities [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsAndContingencies_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Commitments and Contingencies (Note 6)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsAndContingencies_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Commitments and Contingencies</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Ordinary shares, value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock, Value, Issued</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConvertibleNotesPayableCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Convertible promissory note &#8211; related party</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConvertibleNotesPayableCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Convertible Notes Payable, Current</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total Liabilities, Ordinary Shares Subject to Possible Redemption and Shareholders&#8217; Deficit</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liabilities and Equity</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesAndStockholdersEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Liabilities, Ordinary Shares Subject to Possible Redemption and Shareholders&#8217; Deficit</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesAndStockholdersEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liabilities and Equity [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Shareholders&#8217; Deficit</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity, Attributable to Parent [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TemporaryEquityCarryingAmountAttributableToParent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Class A ordinary shares subject to possible redemption, 28,750,000 shares at redemption value of approximately $10.67 and $10.25 per share as of December 31, 2025 and 2024, respectively</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TemporaryEquityCarryingAmountAttributableToParent_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Class A ordinary shares subject to possible redemption</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TemporaryEquityCarryingAmountAttributableToParent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Temporary Equity, Carrying Amount, Attributable to Parent</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Ordinary shares, shares authorized (in Shares)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Ordinary shares, shares authorized</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock, Shares Authorized</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Ordinary shares, shares issued (in Shares)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Ordinary shares, shares issued</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock, Shares, Issued</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Ordinary shares, shares outstanding (in Shares)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Ordinary shares, shares outstanding</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock, Shares, Outstanding</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockParOrStatedValuePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Preferred shares, par value (in Dollars per share)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockParOrStatedValuePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Preferred Stock, Par or Stated Value Per Share</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net Change in Cash</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Excluding Exchange Rate Effect, Including Discontinued Operation</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_CapitalContributionFromOriginalSponsor_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Capital contribution from Original Sponsor</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_CapitalContributionFromOriginalSponsor_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Capital contribution from Original Sponsor.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_OfferingCostsIncludedInAccruedOfferingCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Offering costs included in accrued offering costs</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_OfferingCostsIncludedInAccruedOfferingCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Offering Costs Included in Accrued Offering Costs</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_OfferingCostsIncludedInAccruedOfferingCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Offering costs included in accrued offering costs.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_DeferredUnderwritingFeePayables_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deferred underwriting fee payable</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_DeferredUnderwritingFeePayables_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Underwriting Fee Payables</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_DeferredUnderwritingFeePayables_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The amount of deferred underwriting fee payable.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentReportingDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">SEGMENT INFORMATION</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentReportingDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Segment Reporting Disclosure [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SignificantAccountingPoliciesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">SIGNIFICANT ACCOUNTING POLICIES</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SignificantAccountingPoliciesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Significant Accounting Policies [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfStockDisclosuresAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Initial Public Offering [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_InitialPublicOfferingTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">INITIAL PUBLIC OFFERING</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_InitialPublicOfferingTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Initial Public Offering Text Block</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_InitialPublicOfferingTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure of initial public offering.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WarrantsAndRightsNoteDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Private Placement [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_PrivatePlacementWarrantsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">PRIVATE PLACEMENT</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_PrivatePlacementWarrantsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Private Placement Warrants Disclosure Text Block</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_PrivatePlacementWarrantsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The entire disclosure for private placement warrants.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash Flows from Operating Activities:</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementOfCashFlowsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statement of Cash Flows [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInPrepaidExpense_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Prepaid expenses</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInPrepaidExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (Decrease) in Prepaid Expense</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">RELATED PARTY TRANSACTIONS</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Related Party Transactions Disclosure [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Commitments and Contingencies [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">SUBSEQUENT EVENTS</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Subsequent Events [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NoncashInvestingAndFinancingItemsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Noncash investing and financing activities:</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NoncashInvestingAndFinancingItemsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Noncash Investing and Financing Items [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net cash used in operating activities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash Provided by (Used in) Operating Activity, Including Discontinued Operation</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash Flows from Investing Activities:</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToAcquireTrustPreferredInvestments_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Investment of cash into Trust Account</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToAcquireTrustPreferredInvestments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payments to Acquire Trust Preferred Investments</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net cash used in investing activities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash Provided by (Used in) Investing Activity, Including Discontinued Operation</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash Flows from Financing Activities:</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromOtherEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Proceeds from sale of Units, net of underwriting discounts paid</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromOtherEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proceeds from Other Equity</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromIssuanceOfPrivatePlacement_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Proceeds from sale of Private Placements Warrants</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromIssuanceOfPrivatePlacement_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proceeds from Issuance of Private Placement</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsOfStockIssuanceCosts_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Payment of offering costs</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsOfStockIssuanceCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payments of Stock Issuance Costs</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_ConsecutiveBusinessDays_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Additional execution period</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_ConsecutiveBusinessDays_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Consecutive Business Days</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_ConsecutiveBusinessDays_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Consecutive business days.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_AdditionalAggregatePrincipalAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Additional convertible aggregate principal amount</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_AdditionalAggregatePrincipalAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Additional convertible aggregate principal amount (in Dollars)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_AdditionalAggregatePrincipalAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Additional Aggregate Principal Amount</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_AdditionalAggregatePrincipalAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Additional convertible aggregate principal amount.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_WorkingCapital_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Working capital</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_WorkingCapital_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Working Capital</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_WorkingCapital_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The amount of working capital.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Assets and Liabilities that are Measured at Fair Value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_AggregatePurchasePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Aggregate purchase price</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_AggregatePurchasePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Aggregate purchase price (in Dollars)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_AggregatePurchasePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Aggregate Purchase Price</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_AggregatePurchasePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Represent the amount of aggregate purchase price.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Share-Based Compensation</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement [Policy Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Basic and Diluted Net Income Per Ordinary Share</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Company's Performance and Making Key Decisions Regarding Resource Allocation</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Segment Reporting Information, by Segment [Table Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_CantorFitzgeraldCoMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cantor Fitzgerald &amp; Co [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_CantorFitzgeraldCoMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cantor Fitzgerald Co Member</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UseOfEstimates_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Use of Estimates</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UseOfEstimates_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Use of Estimates, Policy [Policy Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash and Cash Equivalents</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash and Cash Equivalents, Policy [Policy Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Investments Held in Trust Account</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Investment, Policy [Policy Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueOfFinancialInstrumentsPolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value of Financial Instruments</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueOfFinancialInstrumentsPolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value of Financial Instruments, Policy [Policy Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Income Taxes</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income Tax, Policy [Policy Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value Measurements</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value Measurement, Policy [Policy Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_DescriptionofOrganizationandBusinessOperationsDetailsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Description of Organization and Business Operations (Details) [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskBoardOfDirectorsOversightTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Board of Directors Oversight [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskManagementExpertiseOfManagementResponsibleTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Management Expertise of Management Responsible [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskManagementPositionsOrCommitteesResponsibleReportToBoardFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskManagementStrategyAndGovernanceAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Management, Strategy, and Governance [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAssetsMeasuredOnRecurringBasisTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Assets that are Measured at Fair Value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAssetsMeasuredOnRecurringBasisTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value, Assets Measured on Recurring Basis [Table Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskManagementStrategyAndGovernanceLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Management, Strategy, and Governance [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskManagementProcessesForAssessingIdentifyingAndManagingThreatsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskManagementThirdPartyEngagedFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Management Third Party Engaged [Flag]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentOfFinancingAndStockIssuanceCosts_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Class A ordinary shares issuance costs</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentOfFinancingAndStockIssuanceCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payment of Financing and Stock Issuance Costs</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_ScheduleOfBasicAndDilutedNetIncomePerOrdinaryShareAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule Of Basic And Diluted Net Income Per Ordinary Share Abstract</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Diluted allocation of net income</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Net Income (Loss) Available to Common Stockholders, Diluted</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_SignificantAccountingPoliciesScheduleofBasicandDilutedNetIncomePerOrdinaryShareDetailsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Significant Accounting Policies - Schedule of Basic and Diluted Net Income Per Ordinary Share (Details) [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_ClassOfWarrantOrRightMinimumThresholdWrittenNoticePeriodForRedemptionOfWarrants_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Notice period for redemption of warrants</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_ClassOfWarrantOrRightMinimumThresholdWrittenNoticePeriodForRedemptionOfWarrants_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Class Of Warrant Or Right Minimum Threshold Written Notice Period For Redemption Of Warrants</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_ClassOfWarrantOrRightMinimumThresholdWrittenNoticePeriodForRedemptionOfWarrants_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Minimum threshold written notice period for redemption of public warrants.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_RedemptionPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Redemption period</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_RedemptionPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Redemption Period</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_RedemptionPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Redemption period.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_NumbersOfTradingDays_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of trading days</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_NumbersOfTradingDays_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Numbers Of Trading Days</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_NumbersOfTradingDays_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Represent the number of trading days.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_NumberOfTradingDaysPeriodEndingThreeBusinessDays_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of trading days period commencing</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_NumberOfTradingDaysPeriodEndingThreeBusinessDays_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number Of Trading Days Period Ending Three Business Days</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_NumberOfTradingDaysPeriodEndingThreeBusinessDays_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Represent the number of trading days period ending three business days.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Business Combination [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Series of Individually Immaterial Business Combinations [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_NumberOfSharesSubjectToForfeiture_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Shares subject to forfeiture (in Shares)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_NumberOfSharesSubjectToForfeiture_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Shares subject to forfeiture</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_NumberOfSharesSubjectToForfeiture_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number Of Shares Subject To Forfeiture</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_NumberOfSharesSubjectToForfeiture_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The number of shares owned by the founders subject to forfeiture if the underwriter overallotment option is not exercised in the proposed public offering.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashFDICInsuredAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Federal deposit insurance corporation coverage</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashFDICInsuredAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash, FDIC Insured Amount</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_InitialPublicOfferingDetailsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Initial Public Offering (Details) [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_ScheduleOfClassAOrdinarySharesSubjectToPossibleRedemptionAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Class A Ordinary Shares Subject to Possible Redemption Reflected in the Balance Sheet [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TemporaryEquityByClassOfStockTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Temporary Equity, by Class of Stock [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_ClassAOrdinarySharesSubjectToRedemptionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Class A Ordinary Shares Subject to Redemption [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_ClassAOrdinarySharesSubjectToRedemptionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Class AOrdinary Shares Subject To Redemption Member</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TemporaryEquityLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Class A Ordinary Shares Subject to Possible Redemption Reflected in the Balance Sheet [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TemporaryEquityLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Class A Ordinary Shares Subject to Possible Redemption [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Denominator:</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Weighted Average Number of Shares Outstanding, Basic [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_NumberOfSharesIssuedPerUnit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of shares in a unit</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_NumberOfSharesIssuedPerUnit_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number Of Shares Issued Per Unit</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_NumberOfSharesIssuedPerUnit_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The number of shares in a unit.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_SignificantAccountingPoliciesDetailsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Significant Accounting Policies (Details) [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_CommonStockThresholdConsecutiveTradingDays_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Consecutive trading day threshold</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_CommonStockThresholdConsecutiveTradingDays_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock Threshold Consecutive Trading Days</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_CommonStockThresholdConsecutiveTradingDays_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Common stock threshold consecutive trading days.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_FoundersSharesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Founders Shares [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_FoundersSharesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Founders Shares Member</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_M3PartnersMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">M3 Partners [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_NonEmployeeDirectorCompensationPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Non-Employee Director Compensation Plan [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_NonEmployeeDirectorCompensationPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Non Employee Director Compensation Plan Member</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_NumberOfTradingDaysForDeterminingTheSharePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Trading days</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_NumberOfTradingDaysForDeterminingTheSharePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number Of Trading Days For Determining The Share Price</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_NumberOfTradingDaysForDeterminingTheSharePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Number of trading days for determining the share price.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_RelatedPartyTransactionsDetailsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Related Party Transactions (Details) [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_ThresholdPeriodAfterBusinessCombinationInWhichSpecifiedTradingDaysWithinAnySpecifiedTradingDayPeriodCommences_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Initial business combination period</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_ThresholdPeriodAfterBusinessCombinationInWhichSpecifiedTradingDaysWithinAnySpecifiedTradingDayPeriodCommences_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Threshold Period After Business Combination In Which Specified Trading Days Within Any Specified Trading Day Period Commences</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_ThresholdPeriodAfterBusinessCombinationInWhichSpecifiedTradingDaysWithinAnySpecifiedTradingDayPeriodCommences_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The period of time after a business combination which must elapse before consideration of the share price condition for transfer of shares, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_WarrantsPurchasePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Purchase price (in Dollars per share)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_WarrantsPurchasePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Warrants Purchase Price</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_WarrantsPurchasePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Represents the warrants purchase price.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_WorkingCapitalLoanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Working Capital Loan [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_WorkingCapitalLoanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Working Capital Loan Member</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AllocatedShareBasedCompensationExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Director compensation expense</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AllocatedShareBasedCompensationExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement, Expense</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_PercentageOfUnderwriterOfferedInInitialPublicOffering_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Percentage of gross proceed offered in IPO</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_PercentageOfUnderwriterOfferedInInitialPublicOffering_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Percentage Of Underwriter Offered In Initial Public Offering</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_PercentageOfUnderwriterOfferedInInitialPublicOffering_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Percentage of underwriter offered in initial public offering.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_UnderwriterCashDiscount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Underwriter cash discount (in Dollars)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_UnderwriterCashDiscount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Underwriter Cash Discount</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_UnderwriterCashDiscount_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Represents the amount of underwriter cash discount.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_UnderwritersOptionPeriodFromTheDateOfInitialPublicOffering_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Underwriters option period from the date of initial public offering</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_UnderwritersOptionPeriodFromTheDateOfInitialPublicOffering_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Underwriters Option Period From The Date Of Initial Public Offering</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="mbav_UnderwritersOptionPeriodFromTheDateOfInitialPublicOffering_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Represents the underwriters option period from the date of Initial Public Offering.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LossContingenciesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Commitments and Contingencies [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockVotingRights_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of vote</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockVotingRights_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock, Voting Rights</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConversionOfStockSharesConverted1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of shares converted</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConversionOfStockSharesConverted1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Conversion of Stock, Shares Converted</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityRegistrantName_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Registrant Name</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityShellCompany_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Shell Company</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntitySmallBusiness_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Small Business</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total current liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liabilities, Current</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesCurrentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Current liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesCurrentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liabilities, Current [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherAssetsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherAssetsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Assets, Current</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PrepaidExpenseNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Long-term prepaid expense</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PrepaidExpenseNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Prepaid Expense, Noncurrent</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accumulated deficit</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Retained Earnings (Accumulated Deficit)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Advances from related party</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Liabilities, Current</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Preferred shares, $0.0001 par value; 1,000,000 shares authorized; none issued or outstanding as of December 31, 2025 and 2024</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Preferred Stock, Value, Issued</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PrepaidExpenseCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Prepaid expenses, current</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PrepaidExpenseCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Prepaid Expense, Current</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WarrantsAndRightsOutstandingTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Warrant term</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WarrantsAndRightsOutstandingTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Exercisable term</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WarrantsAndRightsOutstandingTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Warrants and Rights Outstanding, Term</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WarrantMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Warrant [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WarrantMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Warrant [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressStateOrProvince_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Address, State or Province</link:label>
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