What does Poly do for a rogue exactly? I see people taking poly a lot, and I am wondering what Poly does that is so great?
Ripped tendons + chicken is a good combo.
Other than that - wings for movement, since rogues can't get enough of that - if team otherwise uses magic damage, medusa's head is awesome for CC - Skin graft for some quite ridiculous turns.
The polymorph school is quite versatile.