Levitating Card Trick
Materials
1 playing card
Clear adhesive tape
2 foot black thread
Directions
Prepare the Playing Card. Using the clear adhesive tape, attach a bit of the thread to the center back of the playing card. Run the other end of the thread over your hand, and then to a button on your shirt or to a belt buckle. You'll need to anchor the other end of the thread on your body. If you choose to use a button, you can form a loop in the thread and wrap it around the button.
Run the Thread. Run the thread from your body over your hand—between your first finger and second finger—and then to the playing card. If you’re right-handed, you’ll want to run the thread over your left hand and launch the card with your right hand. If you're left-handed, reverse the setup.
Launch the Playing Card. Grab the card with your hand. Mimic the motion of launching a Frisbee by folding your hand (bending your wrist), with the card, inwards towards your arm. By quickly straightening your wrist and throwing (spinning) the card, you will cause it to spin on its axis, which is created by the thread at its center. The playing card will float underneath your hand.
Levitate the Card. To make the playing card rise, simply move your hand away from your body. The thread will tighten, and the card will rise to your hand. As the card begins to slow its spin, time it so you can catch the card. Display the front of the card so that spectators won’t see the thread and tape attached to the back.
adapted from The Spruce Crafts