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Creatures opponents control entering the battlefield don't cause backup abilities to trigger.
At the beginning of your combat step, detain target creature with backup or vehicle an opponent controls. (Until your next turn, that permanent can't attack or block and its activated abilities can't be activated.)
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.
