Toxrill, the Corrosive Finish:Nonfoil reveal Progenitus and shuffle it

reveal Progenitus and shuffle it into its owner's library instead

{10}{B}{G}: Monstrosity 10

then reveal cards from the top of your library until you reveal a card with the chosen name

instead create two tokens that are copies of it

except it has haste and "At the beginning of the end step

Toxrill, the Corrosive Finish:Nonfoil reveal Progenitus and shuffle itAt 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.