Yeah, love this idea. I think that as long as there's some cap for damage (40 or something), then it won't be OP. Also, it will need to work like UG rather than Sundial, in that there's a turn where the opponent has a chance to steal/destroy it. Either way, I don't think it will be OP, it'll just ROCK against Rainbow decks, in the same way other cards rock against other types of decks.
I especially like the fact that it encourages on-the-spot creative thinking. When you see your opponent put up the Quantum Hemorrhage, you might start destroying your own pillars or using nymph tears on them or something. It'll add a nice new "element" to the gameplay.
As for the name, why not Quantum Haemorrhoid?
Hahah.