Transposition Acaan by Joseph B

Incredible: the magician finds the spectator's card and the spectator finds the magician's card at the selected number.

This effect is an explosive combination that will kill the spectator!
First of all the specator shuffles the deck and divides it into two parts: one of these he keeps for himself and the other one he gives to the magician. At this point the spectator chooses a card from the magician's packet and finally loses it in his packet.
The magician does the same: he takes a card from the spectator's pile and loses it in his packet.
Here comes the extraordinary event: the magician asks the spectator for a number. For example, the spectator replies 5. Both count 5 cards and incomprehensibly the spectator's card is now in the fifth position of the magicina's packet and vice versa!

Additional supplies may need.