EFFECT: The magician tries to divine a chosen card, but can only narrow it down to four choices. But, when those cards are turned face up, they form a Jumbo image of the selected card!

OR

The magician holds a pack of four cards. A spectator is asked to imagine that the magician is holding four kings. The spectator imagines choosing one, let's say the King of Hearts. When the cards are shown...they form a Jumbo King of Hearts!