A spectator calls out a card, another spectator calls out the number, all free choice. The magician asks the audience to pick one more card from a deck and hopefully it will be the one they called earlier. But it’s not !
The third spectator will get another deck, any deck, shuffle it, and help the performer do a mind reading trick that reveals the card they picked.
Then with the same deck, the named card appear at the called out number. Performer never touches the deck