
InfectInfectThis creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters. (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)
Other creatures you control with infectinfectThis creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters. get +1/+1.
Whenever you cast a creature spell with infectinfectThis creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters., target player gets a poison counterpoison counterA player with ten or more poison counters loses the game..
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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.