Arwain, Wolflord

As an additional cost to cast this spell, sacrifice
Arwain, King of Old.
When Arwain, Wolflord enters the battlefield or
attacks, you may exile two cards from your
graveyard. If you do, it deals damage equal to it's
power, divided as you choose to any number of
target creatures or planeswalkers.
Few have seen his transformation. Fewer still have
lived through the experience.