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Choose target creature. If you're on the Mirran team, put a +1/+1 counter on that creature and it gains lifelink until end of turn. If you're on the Phyrexian team, put a -1/-1 counter on that creature and it gains deathtouch until end of turn.
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.
