With 3-4 players the cards get hard to sort out after a hand. What about that?
During play, when you cast a Mystic or Counter, you don’t have to throw the cards in a common “play” pile, just lay it down or hold/show it at your position and the Opponent can see it there. Just flip the card out (like a Wounding) in front of you. Opponent does not need to lay his counter-card on top of yours.