This is a GAG Card and you can use it in different ways in your show.
Show the envelope and say that inside there is a prediction. Show the deck with 52 cards and use any kind of force to force the top card. Ask to the spectator which card he choose and say that his card is inside the envelope. Show the side with 52 in one and point to the card. The spectators will laugh with your act. Next, you can say that you can do it better. Show the back of the card and it's exactly the spectator's card.
