Text (PC+errata): */*. ; Morph {2}{U}. ; As ~this~ enters the battlefield or is turned face up, it becomes your choice of 5/1 or 1/5. [Oracle 2009/07/08]
The choice is made right before it comes into play and it enters play as the chosen power/toughness. [Planar Chaos FAQ 2006/12/13]
A copy entering play will get to make the choice, but a creature that becomes a copy while in play will copy the choice. [Planar Chaos 2006/12/13]
