The magician hands over a deck of playing cards to a spectator & asks him to thoroughly shuffle the cards.The magician then instructs the spectator to remove any 3 cards from the pack, mentally select any one of them & place all 3 in front of the performer on the table.After some time the magician is able to correctly divine the selected card.
Key points of my version:
No markings on cards or one way backs.The cards can even be borrowed
No forcing of cards involved.Spectator handles the cards himself.Cards are not stacked.
No stooges,preshow work,electronics etc.100% impromptu effect.Performer can even be blindfolded genuinely or be in another room when the selection is made.
Only 3 cards are involved.No adding or taking away of cards.Cards are in full view all the time.
Can be performed by magicians irrespective of skill level.May be performed surrounded.
Complete pdf of working along with explanatory video provided.