Was sitting in lecture today thinking about this. And I'm pretty sure it's the best possible Healer any group could ever want.
Cleric 6/Martyred Champion 5/PrC Paladin 1/Dweomerkeeper 8
(Su)Invoke Magic and Delay Death Persisted
Persist Greater Vigor for fast healing 4, which heals 5760hp over 24 hours.
Contingency to Invoke Magic Plane Shift away from AMF
Cast Blessing of the Martyr on everyone you know.
Take Battle Blessing.
Cha>Wis>Str and dump the rest.
Chain Blood of the Martyr every round and do whatever the hell you want with your +40 Skills, Attacks and Saves. Which you do spontaneously.
No one near you ever gets killed by HP damage unless they get 1 rounded. Except you also persisted Favor of Ilmater so you Celerity all day long.
Take the Hero domain. Persist Giant Size.
Grab a Wrathful Splitting Hank's Bow.
Persist Giant Size and walk into melee, threating with IUS, while shooting everyone with your bow, eating AoOs.
Still have one (Su) spell left per day to drop on shit like Miracle or True Resurrection.
Buyoff the Saint template to get even sillier.