Pentro Card by Bill Pryor

EFFECT: A card is selected, returned to the pack which is shuffled. A small envelope is shown empty and then slipped into the centre of the pack. The magician gives a sharp rap on the top of the deck with his fingers. All the cards above the envelope are lifted off and quickly run through face up.

The selected card is not seen. Next, all the cards below the envelope are similarly looked through, and again the selected card is not among them. Slowly and deliberately the magician turns over the envelope, opens it, and one card is seen to have penetrated through to the inside. When it is removed, it is of course the selected card.