Jazz: Oh, I don't doubt that the disease clouds are diseasing the enemy.. but what is that really doing for you? Not many people would want to lose an army to kill an opposing army 10-20 turns down the road.
I can see your concern with differentiating from C'tis (especially MA C'tis). Have you considered switching Death for Blood? I may be just losing my mind, but I can't think of many nations (other than Mictlan, and not in MA) that has good Water, Nature, and Blood Magic. Well, there's Jotunheim, but heims are heims.
