The joker is a useful tool for bluffing in rummy, so use it strategically. The joker is a useful tool for deceiving opponents into believyono sloting you have particular cards when you don't, or for inflating the perceived strength of your hand. 4. . Keep your cool: When bluffing in rummy, coolness is essential. Throughout the game, if you have been discarding cards, stick with it even if it isn't part of your plan.