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As an additional cost to cast this spell, sacrifice a creature.
Add {B}{B}{B}{B}.
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.
You must sacrifice exactly one creature to cast this spell; you cannot cast it without sacrificing a creature, and you cannot sacrifice additional creatures.
You sacrifice a creature when casting the spell and you can’t sacrifice more than one creature to get extra mana.
