New cool (probably crap) Gamemode concept idea

I was thinking of a gamemode where maybe every few minutes every champion on the team swaps around meaning throughout a game people have to change their role and play style. this probably wouldnt work on a map like summoners rift, but maybe like howling abyss and, another cool idea would be that scores would be personal so that maybe when the fed katarina who is 10,2 switches into garen it is now a 10,2 garen and a 0,7 katarina, possibly changing the way team fights worked. also builds would stay on the champion as well as gold.