I think it would be cool if there were new schools like water, earth, or even plants. But I think a really good idea would be:
Water 95% accuracy
Level 1: Splish Splash Fish 75-125 Damage A fish flops on your opponent Level 5: Whirling Waters 155-255 Damage Your opponent falls in a whirlpool Level 8: Washed Out Dispels Your opponents next spell Level 10: Crab King 295-355 A huge crab with a crown shoots water from its pinchers that gushes at your opponent Level 16: crab army 365-445 a bunch of crabs put their pinchers in the ground causing an earthquake to hit your oppponent Level 22: Raging Waters 365-445 damage to all opponents a tital wave hits all of your opponents Level 26: Washed Away weakens all non-water spells by 40% Level 33: Ghostly Submarine 555-600 an abandoned submarine appears and falls on your opponent Level 42: Abandoned Ship 650-850 a ghostly ship shoots many cannons at your opponent