Overusing wild cards can make opponents play more defensively against you by giving them the impression that you're about to win. Timing of Wild Card Use Effectively. Insteek rummyad, think about keeping wild cards until they can be used most efficiently, like when you're only one card away from going out or when they can make several possible melds at once. Understanding the strengths & weaknesses of wild cards will help you improve your gameplay and keep your opponents off-balance. How to Play Wild Cards Proficiency.