Corruption

Creatures with the ability "Corruption" deal damage in
the form of -1/-1 and corruption counters to creatures and "Corruption" Counters to players. When a player reaches 20 "Corruption" counters, they lose the game. Whenever a player with one or more "Corruption" counters gains life, they remove that many "Corruption" counters. Whenever a nonland permanent reaches 20 "Corruption" counters, it dies, and it's controller sacrifices it.
"Go my children, spread the darkness of nightmares into every part