In a game played yesterday, one of my opponents chose the Warlock (random selection). Everyone else groaned, because we all know that particular player loves to spell-cycle, and he's usually quite good at it.
It started me thinking that I'd like to have some way to restrict other players, such as a Curse that could prevent someone from casting spells, or only allow them to move in a clockwise direction, or miss a turn if they land in the woods, or only be able to use their starting values in battle / psychic combat, until they were able to complete some action and remove the Curse. It would function similar to a Quest, but completing a task would remove a restriction rather than gain a reward. We all know that characters are not equal, and the ability to negate some of those inherent advantages (at least temporarily) might add a new fun element to the game.
A separate Curse deck would be ideal, and maybe could even be tied into the long anticipated Dark Fate concept (pay a Dark Fate to force someone to draw from the Curse deck!). I'd be in heaven if the 4th corner was a Swamp, filled with dark magic including a Curse deck.