Wurmquake

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 {8}{G}{G} (You may cast this card from your graveyard for its flashback cost. Then exile it.)