Toxrill, the Corrosive (Showcase Eternal Night) [Innistrad: Crimson Vow]

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, creature a 1/1 black Slug creature token.

{U}{B}, Sacrifice a Slug: Draw a card.