Warrior priest is broken because of the orb system. His first morale ability allows him a chance to start a whole new chain of combos. his healing abilities are weak, but when he can chain up to full shields on many turns that doesn't really matter.
The fact that he can heal and deal almost as much damage as a squig herder and negate some of the squig herder's abilities is what's broken. Although i've been trying on the hardest difficulty lately and the only way i've been able to win has been using the mage and killing the computer in 2 turns /shrug
Chiel Greenchucka rank 20, RR16 the little shaman that could