If your hand is strong but you are lacking one or two essential cards to finish it, you might want to discard a heart card that your opponents might think is valuable. They might pia23rummyck up the card as a result of this tactic, which could reveal their strategy & let you modify your gameplay accordingly. Keeping Track of Heart Cards to Get an Edge. Also, by monitoring which heart cards have been discarded or played, you can more accurately determine the chances of finishing your own melds while also preventing your opponents from doing so.