"Blanked" is an effect that will amaze your audience.
The magician shows a pack of playing cards and the spectator can freely pick any card he/she wants. The card gets returned into the pack and to make the things a little bit harder the cards are shuffled facing up into facing down. The deck gets spreaded in front of the spectator, so he/she can check that the cards are really mixed up. The magician tells, that by just snapping his fingers all the cards are going to face in the same direction and by just flicking the deck every card will vanish except for the selection.
He does excectly the things he promised, and it really happens.., all the cards look in the same direction and... they are BLANK, except for one of them... THE SELECTION.