Toxrill, the Corrosive (132) (mythic) | LP

This is a Lightly Played card, from the Innistrad: Crimson Vow set. It has a color identity of: B/U.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. {U}{B}, Sacrifice a Slug: Draw a card.