Hmm.. in that case it might be underpowered. It seems to me that it would only be really usefull in a mono
deck, because I never have extra
in my rainbow decks (even with that is my mark). Since it would likely have to be played in mono
deck, then you will likely be casting a lot of things that use up all your
meaning that this isn't helpful until late game, and even then, when you divide by 10...
I guess you would have to play test it to find out for sure. I like the concept, though.