Raven Guild Beguiler

Morph - {u} (You may cast this face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)
Whenever Raven Guild deals combat damage to an opponent, you may gain control of target creature that player controls with converted Mana cost X or less. Where X is the number of noncreature spells in his or her graveyard.