Spectator chooses one card and signs it.
The magician puts the card back into the deck.
The magician signs the top card and puts a sticker on it...
Suddenly, the sticker starts jumping onto other cards until it finally disappears.
The magician spreads the deck and shows that the sticker has jumped on the card chosen and signed by the spectator.
The gimmick is easy to make.
No elastic required.
Don't wait and buy now!