I don't really like this idea in that everyone's boosts tend to be for their school cards and not for non-school cards. I would rather see spell conversion blades or spell conversion bubbles that changes the attack after initial casting. You cast as your own school and then it converts into another. With conversion blades people can get dispels under the conversion blade if they cast before you do, with conversion bubbles they would not be able to, but I am not sure which way would be best for game play.