[DMM] Here's an example of a good rainbow setup. Notice how he still has FULL Thunder weps, because as Slashley said, they're there for support and not damage. Cthulhu for her debuffs, and Azazel for her insane buffs whilst having ThorAW/Baal U in main team with them.
SatanAW+RaphAW in subs for orb eats/debuffs. Debuff builds are the way to go.