Certain cards are known as wild in many variations of rummy, which means they can stand in for any other card in a run or set. Gaining a significant edge over your rivals can come froall rummy bonusm knowing how to use wild cards. For example, if you are holding a wild card, think about strategically using it to finish a meld that would be challenging to accomplish with the other cards. On the other hand, using wild cards requires caution. They give your opponents a warning that you are about to go out, even though they can speed up the formation of melds.