One and Only Trick by Paul Harris

You remove a flat, invitation-size envelope from your pocket and dump out an "invisible deck". You direct a spectator to freely "destroy" these imaginary cards until only a single card remains. Let's say the Queen of Diamonds.
 
The spectator tosses the invisible Queen of Diamonds toward the envelope. You then slowly and cleanly remove the "one & only " card in the envelope. It's the spectator's "one &only" Queen of Diamonds.
 •The Envelope is clearly seen to contain no other cards after the "one &only" card is removed.
 

•The card in the envelope is always the exact card named by the spectator.
 

•Uses just one envelope.
 

•No palming, switching, or loading of the envelope.
 

•Self-contained.
 

•Resets in seconds.
 

•Perform sitting, standing or while aimlessly wandering around.