With this information, you can predict possible sets and runs, which improves your chances of winning. Taking Care of Expensive Cards. Knowing when to hold onto & when to discard high-valuslots master - win moneye cards is a crucial part of cultivating a strategic mindset in the game of Rummy. If you have high-value cards like Aces and Kings and are about to form a set or run with them, holding onto them can help. However, it can also be risky if you can't use them and they end up counting against you at the end of the game. Playing Rummy requires observing & evaluating opponents.