Keliana, the bane of man

Flying, protection from white
Hellish offerings:{3}{b} sacrifice a creature or creature token, target one permanent your opponent controls with the same mana cost and exile it.
Everlasting night:{t} untapp all mana sources on your side of the field capable of producing black mana.
Succubus charm:{x}{b} target one creature your opponent controls and gain control of it. When keliana leaves the field, send it to original owners graveyard unless they pay half its mana cost