You're epic level. You can be assumed to have basically infinite money. Buy tens of thousands of allies - adventures, guild guys, militia, whatever - and have them attack the divine casters constantly. And I do mean constantly. Allow your enemies no sleep. You want a 24 hour total war. And don't forget about what you can summon! Spam elementals!
I finally went with, not fully fleshed out but enough to get me started.
(Any credit to @KRyan, and criticisms to @JoeNapalm)
Wild Elf w/ Arctic Template from Dragon 306: +2 Dex/Con, -2 Int/Cha
ACF - Whirling Frenzy (UA)
ACF - Lion Totem (CC, not to be confused with UA)
2 Flaws (Implacable and Cold Blooded, Dragon 310)
Feats: Martial Study (...