You may have Glasspool Mimic enter the battlefield as a copy of a creature you control, except it's a Shapeshifter Rogue in addition to its other types.
//
Glasspool Shore
Glasspool Shore enters the battlefield tapped.
T: Add U.
You may have this creature enter as a copy of a creature you control, except it's a Shapeshifter Rogue in addition to its other types.
: Add 
.