Here's another magic trick involving only three cards, so there isn't a full deck to confuse the onlooker. Magicians often use a disappearance to astound the audience, so here's one you may not have seen.

Three cards in a fan are displayed to the audience. The middle card is a court card.
The fan is closed and placed on a table. The magician, revealing that the court card has now become invisible, places the phantom card in his breast pocket.

Sensing the audience's distrust, he immediately reaches into his breast pocket and withdraws the court card, placing it back between the two cards still sitting on the table.

Video shows the effect.