Best race for a rainbow pretender?

[Taqwus]

Ermor, w/ Ashen Empire (if it's anything like Old Ermor) and probably Soul Gate Ermor. At least with Ashen Empire, you should be able to take the Scales from Hell and get LOTS of points. You'll need the magic, actually, since your dominion will kill your taxpayers rather quickly (unless you wipe out your own dominion with stone idols) and thus alchemy income will be disproportionately important to you.