[@HeySeuss] Hmm... Well, perhaps your character is not trapped under a single school of magic? It would weaken each school more and more schools he could work with. He could use this talent to alter the terrain by controlling water to form mud in the water and then use fire to bake it if his troops needed to advance. His powers in each would be limited to just simple control of whats in front of him but utility would make it worth it.