game mode where a Champs skill set is anothers

You pick a champ and that champ and it's skills are randomized for the duration of the game, example an Amumu with a different skill set....and you won't know til you try it..... having a random skill set would change the outcome of the build and the outcome of the gameplay. I think this would be hard to do as the dynamics are already delicate, but for a mod.

Maybe keep it to the 10 Champs played, and randomize all in the battle, once again keep it secret til they have to use it, as it keeps the balance fair to c both sides.