...just the summons from the original gutted from their respective trees and put into a new one...
Not true:
Summoning Master - To be able to summon allies is a very powerful skill, but as a master you'll be able to summon more than one extra ally. Other skills will include redirecting incoming damage to your summons; sacrificing them to heal you, or blowing them up to wreak havoc among massed enemies.
I voted Bard, but am still happy.
As for Polymorpher - As a polymorpher, your body is your oyster. Grow sharp-as-swords horns, poisonous tentacles (with the bonus of further reach) or even wings that allow you to dash and dive across the battlefield. You can even change completely into - what? Something monstrous, that's for sure...
That "dash and dive" indicates they'll have abilities tied to the form, not just buffs.
Perhaps allowing forms so small that they don't usually trigger combat?
