As unupped decks go, that actually looks like it might have a reasonable chance vs rainbow, certainly better than many other unupped decks, and better than any I can think of. I've been keeping track of my oracle games for awhile, and I have a 1-2 record with voodoo universe and a 1-0 with splat. I've also used RoL/hope but for some reason I don't have my stats for that; I think it's in the same neighbourhood, though, pretty sure 1-1.