Carabao by Geni

With a borrowed deck, the spectator freely says stop at any number of cards to create a smaller packet. The Spectator cuts the magician's pack into 4 piles. With the extra pack of cards, spectator freely select a random card (No force) and places it on any pile of they've just cut.

the magician will pick a random lucky card, and place it into one of these 2 piles of the magician. After that spectator freely deals into 2 piles one by one , whichever pile does not have the lucky card will be eliminated. After dealing, there only 2 cards still that will be magician lucky card and spectator's card.