Hmm....it might be better to randomize only half of the discards, or something, as losing cards that one had to spend a large amount of time and money on getting would be quite frustrating. I certainly see how you want to make it possible to lose them, but if a loss almost definitely means you're going to lose at least one rare card(I'm just going off of approximate odds) later in the game, that could be a problem. Unless you want it to be easier to permanently kill someone whose element is being destroyed, which is not a bad idea, to make there be more of an endgame.