This is a GAG Card and you can use it in different ways in your show.
Put
the GAG card face down over the table and tell to the spectator that it
is your prediction. Give the deck of the cards to another spectator and
asks to choose a number between 10 and 20. Count the number of the
cards that represents the chosen number (Putting one card over the
other). Then tell the spectator to give the cards for two players
alternating the cards. Now you have two piles of cards and the top card
of each pile will determine your prediction. You can say that you feel
that the top cards have the same suits and the result of the summary of
those cards will match with your prediction. While revealing the cards
pretend that there is something wrong, but we know that a magician never
fails...and show the prediction.
Card measures: 8" x 11-1/2" (20.3cm x 29.2cm)