-Bard (group buffs, the only mana heal and good group healing)
-Invoker (shields and semi-good damage)
-Anti-paladin (damage in massive amounts plus a/b/s)
-Healer (obvious)
-Warrior (Vanguards/Trapping fire giant with polearm/sword)

That could kill pretty much anything. You can substitute a shifter for the tank if you're fighting something that's not immune or add a transmuter if the warrior doesn't have haste and/or the mob can be softened.