Voyeur by Romanos and Titanas

 In the fairest way, while your back is turned, the spectator selects a card. The card is returned to the deck and the deck is placed inside the card case. Only then the magician turns his head and instantly knows the identity of the card.

 * No electronics

* No Force

* No Magnets

*No Rough and smooth

*No Markings

*No memorized or stack deck

 Very innocent looking gimmick and instant reset. Immediately repeatable with different cards.