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Yigal Mesika's Boomerang Card is a beauty!

Imagine. At any time during your act, demonstrate your incredible talent of spinning a card off the top of the deck, and having it shoot out towards the audience.
When the card travels about ten feet, it does a 180 degree turn and returns to your hand!
The audience will be picking their jaws up off the floors, and they will think you have supernatural powers!