A useful card can be discarded to give the impression to opponents that you don't need it, which is one way to engage in bluffing. They may discard cards that areyono slot helpful to you as a result, or they may choose cards that are counterproductive to their own plans. Getting Good at Trickery. In order to bluff effectively in Rummy Arena, you must pay close attention to what your opponents are doing and consider your options carefully before deciding how to use deceit to your advantage.