Not for gs, but I think it would be a nice idea for some other type of game mode. Revolving around moba based gameplay.

iClassic, "we have hearthstone, and moba game modes."

Just changing hp and damage done doesn't sound like a class system. If you were going for a moba style mode, then you would need something like "can only use arrows", bombs, swords, tank doing little damage. Would be fun. If ToonsLab were to make a moba, with graal characters, I'd play.