Aberration Hunter

Lurk {c}{c} ({c}{c}: Turn this card face down. While face down it is a 3/3 creature with no color and no creature type. Turn it face up at any time by discarding a card.)
When Aberration Hunter is turned face up, destroy target non-human creature.
Manashift {b}{b}{b} (You may cast this spell for its Manashift cost. If you do, it becomes black and loses all other colors.)