Alley Assailant (MKM-076) - Murders at Karlov Manor

Alley Assailant enters the battlefield tapped.
Disguise (You may cast this card face down for as a 2/2 creature with ward . Turn it face up any time for its disguise cost.)
When Alley Assailant is turned face up, target opponent loses 3 life and you gain 3 life.