As an additional cost to cast this spell, sacrifice a creature.
Draw cards equal to the sacrificed creature's power.
7/18/2014 You must sacrifice exactly one creature to cast this spell; you can’t cast it without sacrificing a creature, and you can’t sacrifice additional creatures.
7/18/2014 Players can only respond once this spell has been cast and all its costs have been paid. No one can try to destroy the creature you sacrificed to prevent you from casting this spell.