This effect has extraordinary potential because it is based on an extremely sneaky method. The magician without ever looking at the deck is able to reveal the card that the spectator has in his pocket. A true miracle. A magician fooler, as in the dtile of Joseph B.
You can put your own presentation into this effect and, without a doubt, it will be one of the most powerful effects in your repertoire.
You have all the materials at home to construct the gimmick.