Corrupted

Cards carrying the Corrupted ability word, which switches on bonus effects only while an opponent has three or more poison counters. Skrelv's Hive hands lifelink to your toxic creatures, Vivisection Evangelist destroys a creature or planeswalker when it enters, and Contaminant Grafter draws and plays a land at end step, each conditioned on that three-poison threshold. Narrower subset of Poison Synergy, the broad grouping for poison-counter payoffs and enablers; Corrupted is specifically the printed checkpoint ability that reads its bonus off opponents' poison total rather than any card that piles on or proliferates those counters.