Toxrill, the Corrosive - [Foil] Innistrad: Double Feature (DBL) VOW creatures you control have base

creatures you control have base power and toughness X/X and gain all creature types

where X is the amount of mana spent to cast it

At the beginning of each player's upkeep

then return it to the battlefield tapped under its owner's control

Nicolas Raoult

Toxrill, the Corrosive - [Foil] Innistrad: Double Feature (DBL) VOW creatures you control have baseAt 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.