The Magnetic Hand

Effect: In this mysterious easy magic trick, you somehow cause several playing cards to adhere to your hand as if it were a magnet. Unlike most card magic tricks, this one offers a visual effect that doesn't rely on spectators selecting and memorizing a card. This one takes some preparation ahead of time, but the results are well worth it.
Secret: A gimmicked card.
Materials: Ten playing cards To make the gimmick: scissors and glue

Using the scissors, cut a flap into a playing card, as shown in the figure. You'll need to make sure that the flap can easily fold up and down.

Glue the card with the flap onto the back of another card. Make sure that you don’t glue the flap down onto the second card. The flap must remain free.

After the glue dries, you'll have a card with a flap in its back.

With the secret flap up, you can hold the flap between your middle and ring finger, and securely hold the card. This is the secret to the trick.

With your hand held palm up, show the cards and get the gimmicked card into your hand with the flap up. Grab the flap using your middle and ring fingers. Insert the other cards underneath the gimmick but allow them to stick out around the sides. The other cards will be held between your hand and the gimmick. At this point, gravity is apparently holding the cards in your hand.

Slowly turn your hand over and show that even though it's upside down, the cards somehow stay adhered to your hand. When you're done, turn over your hand and release the gimmicked card. If you can, secretly fold the flap down, which will allow you to display the cards both front and back. You can drop the cards onto a table and allow spectators to examine your hand.