[3.5] Divine Power & Righteous Might domain only

[Pharaoh's Fist]

I think you're forgetting that this takes 3 standard actions to stack up, only lasts for 1round/casterlevel (1min=10 rounds for favor) and uses 3 valuable spell slots.
In a long combat these will wear off, in a short combat it's half over by the time you are fully buffed.

We're concerned about Divine Metamagic and Persist Spell shenanigans here.

Tensor's transformation almost does the same thing in one spell for wizards/sorcs.

Except wizards have no combat feats and Tenser's prevents them from casting any spells.