Creature - Wall 0/5, 1U (2) Defender (This creature can't attack.) {3}: Turn Wall of Deceit face down. Morph {U} (You may play this face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)1
Illus. John Avon
The trigger occurs when you use the Morph ability to turn the card face up, or when an effect turns it face up. It will not trigger on being revealed or on leaving play. [Legions FAQ 2003/01/23]