Boiling Emergence

Whenever an opponent casts a creature, you may pay x. If you do, deal x damage to your choice of that creature or that creature's controller.
{x}{x}{x}{r}{r}{r}: Remove all counters from target creature. Deal x damage to that creature. It cannot be regenerated.
{x}{x}{x}{x}{x}{r}{r}{r}{r}{r}: Deal x damage to target player, where x is the amount of creature cards in his or her graveyard that were killed by this card