Toxrill, the Corrosive (Showcase)

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.