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Toxrill, the Corrosive

Legendary Creature — Slug Horror

At the beginning of each end step, put a slime counter on each creature you don't control. Creatures you don't control get -1/-1 for each slime counter on them. Whenever a creature you don't control with a slime counter on it dies, create a 1/1 black Slug creature token. , Sacrifice a Slug: Draw a card.