I tried it, and it failed pretty hard. I have 2 dragons and 3 electrocuters, which are needed fairly early against something like half the gods, and on the first or second turn against Fire queen and osiris, at least, 4 hopes, 6 RoL, and 4 fractal, to give as high a chance as possible to draw a hope, RoL, and fractal as early as possible without completely clogging up my hand (so fractal still works). so far it's worked well.
The problem with PU is that against an enemy that never plays any aether or light creatures, I can't mount enough attack to defeat them. Any god with miracles is much harder without the ability to rush 6-8 dragons in one turn. Good idea, but the dragons are extremely important, since I can generate a LOT of light quanta and play a bunch of dragons at once. Also, being able to play as many dragons as I want lets me get EM a lot of the time by damaging my opponent to just below death, healing, and then finishing with the elctrocuter. With PU, I wouldn't have that ability a lot of the time.