Acroma, the Fallen Wrath

Flying, lifelink, Wither, Poisonous 5. As an additional cost to cast Acroma, the Fallen Wrath, pay 5 life, and sacrifice a creature.
You may cast Acroma, the Fallen Wrath from your graveyard. When Acroma, the Fallen Wrath leaves the battlefield, if she would go anywhere other than your graveyard, instead she goes to your graveyard.