The impossible nested prediction

The mentalist displays a completely sealed envelope, then a spectator freely names any card. The performer takes out a closed card box from inside the envelope. The spectator holds the box and opens it. Inside the case, there is a deck of cards and a prediction folded into quarters. The prediction reads, for example: "Your card will be the number 14." The spectator counts 14 cards in the deck and finds his freely named card!

• The spectator can name ANY CARD
• No memory or calculations
• Both sides of the card box are shown
• The spectator takes the cards and the prediction from the box
• Use your own deck of cards