
When this Vehicle enters, return target artifact or creature card with mana valuemana valueThe total amount of mana in a card's cost, ignoring colour. A card costing has mana value 4. X counts as 0 except on the stack. X or less from your graveyard to the battlefield.
CrewCrewTap any number of creatures you control with total power 2 or more: This Vehicle becomes an artifact creature until end of turn. 2 (Tap any number of creatures you control with total power 2 or more: This Vehicle becomes an artifact creature until end of turn.)
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Read from the rules text. A card that enables a keyword makes or is the thing; a card that rewards it gets better when you have it. Two cards interact when one enables what the other rewards.