Greedy Grinner

Set aside any number of cards from your score pile, then choose an opponent and they do the same. Then you both play a game of Rock-Paper-Scissors. The winner scores cards from the top of their deck equal to the number of cards they set aside and returns the set aside cards to their score pile. The loser discards the cards they set aside. If there is a draw, both players return their set aside cards to their score pile.