Deadly Visitation

Manashift {3}{w}{w} (You may cast this spell for its Manashift cost. If you do, it becomes white and loses all other colors.)
Choose target creature card in your graveyard. If Deadly Visitation is white, return that creature card to the battlefield. Otherwise, exile that card from your graveyard and another target creature gets -X/-X until end of turn where X is the exiled card's power.