The moon school has really died down. Sure, polymorphs were a bit of help in Celestia, maybe part of Zafaria, but then its the most deadly thing you can do.
I proposed an idea where you can polymorph into a different school. For example: Lets say your a life. Hat, robe, and boots of esprit. Cheiftain's Smiling Deck. Set up: 6 forest lord, 6 lifeblades, 5 fairies, 4 satyrs, and 3 rebirth (just a guess mine is set up WAY better :P)
You want to polymorph into a Myth wizard. You then get Tricksy robe boots and hat (your look stays the same) You get the bundle of Anasies Stories and it is set up like this: 6 medusa, 6 Myth blades, 5 pixies, 4 humongofrog, and 3 Orthrus; for 6 rounds.
Now, your stats will change too. (i.e your resist will boost up, health will shrink, damage will accomodate what you have on, and etc...) Keep in mind, this IS a polymorph, so you will NOT get the full benefits of being a myth wizard. This is just a temporary change. This also can't be abused in PvP because A. who in their right mind would use this in PvP? and B. You will be taking a serious risk.