Text (LE): 2/3. ; Morph {2}{U}. ; When ~this~ is turned face up, you may turn target creature with morph face down.
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]
It can target itself and turn itself face down. [Legions FAQ 2003/01/23]