This App allows you to perform a cardtrick without a physical deck of cards. It also allows you the magician to take all the credit as the App apparently has nothing to do with the trick, its just a substitute for a real deck of cards. It is very easy to perform yet very deceptive to the audience.
Use this App when you want to show a cardtrick but dont have an actual deck of cards. As a solution to this problem you announce that you have a "virtual deck" on your iPhone. Show the spectator how to use the App to select any playing card.
First a suit is selected. All the cards of that suit including a joker will be displayed. One card is touched (selected) and comes full screen. The spectator remembers his card and touches it again taking the App back to the main screen and hiding the selected card. The iPhone is placed on the table. You dont touch the iPhone and can apparently read the spectators mind and correctly name their selected card!