J To 3 Change frame .

A jumbo card - the Jack of Hearts is shown, it is then placed into the card frame with it's back facing out. Card is visible in the frame at all times. When the card is removed, it had become the 3 of Clubs. Impossible! There's even a hole right in the center of the frame. There's no possible space for any card to be hiding inside.

Easy to do magic trick.