The problem is that it's hard to draw the things you need in a Rainbow, though i didn't test your version yet.
Today I encountered Hecate again, and with some new mods, I could do a whopping 244 HP EM on him.
(which means more gold when winning)
Here is the deck:
Hover over cards for details, click for permalink
5l8 5l8 5l8 5lc 5lc 5lc 5lc 5lc 5lc 5lm 5lm 5lm 7jo 7jo 7jo 7jo 7jo 7jo 7jo 7jp 7jp 7jp 7jp 7jp 7jp 7k2 7k2 7k2 7k2 7k2 7k4 7k6 7k6 7k6 7km 7km 7km 7km 7km 7km 8pq
Finally I think I can say that this deck has an answer to everything (well, almost). Miracles and SoDs can stall in the early game unless Hecate gets a very fast hand and outrushes me while I'm drawing for quanta - which can sadly happen. The Sanctuaries are bound to be stolen here, but as long as they are up, they protect from Nightmare. Holy Light handles the raged dolls with 10 or less HP. And now, the forever alone Hope + RoLs take care of Eclipse. The only thing I can't remove with this is the poison, but that's manageable when you have tons of HP.
Finally to get the EM, keep a miracle and a sanctuary in your hand until the last turn, then play Sanc+Miracle (in this order) to get the EM.
It's still a subject to test later, because i can't know from one test if i got lucky or if it really has potential... Will come back to it later maybe.