Phyrexia: All Will Be One Commander
Corrupted — Create an X/X green Phyrexian Wurm creature token with trample and toxic 1, where X is the amount of mana spent to cast this spell. Then for each opponent with three or more poison counters, you create another one of those tokens.
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)