PCAN (Predicted Card At Number) by Mark Cahill

The spectator shuffles the cards, and the magician removes one card as an Open
Prediction for all to see. A three-digit number is called by the spectator, and the magician deals cards to the table to match each digit, leaving a random card to the side for each number. The three cards placed aside are then added up
to the random number they achieve. With the deck now face down, that
number is counted down to, and miraculously it reveals the mate to the
prediction card initially laid on the table.

No dupes, No gimmicks, No tape, No magnets, No smoke. No mirrors,

Spectator shuffles, Any 3 digits named. This is PCAN