Interesting concept but I see at least 3 problems with this:
1. The fact that you think it needs a casting cost anywhere close to this high should probably be a good sign that the effect is just too powerful to really be used.
2. On the other hand, the fact that it is generic quanta means it would only take 2 supernovae to play this, which seems much too easy(though there is something oddly appropriate about a supernovae causing an extinction level event...)
3. Combining the above two issues, this basically means this card would only be playable in a rainbow deck. I would say rainbow decks are already too powerful as it is and if anything, should be nerfed slightly, not given an exceptionally powerful card which is only likely to be used by them(and possibly a few others like fire stall decks, pestal etc. that have more quanta than they know what to do with late in the game)