Here's an idea, we already have amulets to cast another schools spell(which cost us crowns). For instance I'm a level68fire wizard and I have a death amulet(know all the school spell) I also know all the life spell. However, how about doing quest in order to use the other schools spells? In life I only got up to Centaur I never used my training point to get its bubble thing:P We have to get all the school spell and we do a quest in order to obtain using power pips for that spell. It becomes our equipment for the necklace. And the more schools we finish(completely minus the balance tree's Blades and Traps-optional-), it is equiped with the other amulet that we finished.
Then with that of course you have to meet requirements(Like at least level 70 or higher. Or using the schools spells a certain amount times). We shouldn't be allowed to use other schools spells as treasure card. Like using their level55 and higher spells(pip castlike 6 and more-the ones not on the school list), but there are others that are just hialrious to use. Since I'm fire I shouldn't be allowed to use Frankenstien, Scarecrow, or Skeletal Dragon-those kind of spells for high leveled wizards. It what makes their school special and a low level wizard who has the amulets can't just magically use it.
But some treasure's are too funny to ignore, it's a pain to summon, but hilarious to use. Woodwalker, Nature's Wrath, all the weird Samurai Pigs for each school :D
And for anybody like me who have bought the amulet through the crown shop we are the only ones that can "trade" in our amulet and get other crown stuff that are worth the same. KI won't be losing money just getting stuff worth the amulet cost.(amulet=3000, buy back other things up to that cost)
In my opinion it would make the game more interesting because wizards should be able to use many spells. Some wizards are specialist at their school while others are specialist at using every schools.
