Unnatural Healing

Manashift {1}{b}{b}{b} (You may cast this spell for its Manashift cost. If you do, it becomes black and loses all other colors.)
Return target creature, enchantment, artifact, or planeswalker card from your graveyard to your hand. If Unnatural Healing is black, each opponent loses X life, where X is the converted mana cost of the card returned this way.