You have one blank card, nothing more. Ask the spectator to turn on the flashlight of his smartphone and to name any card.
Then, put the blank card above the flashlight... you can see the value of the card he named!
Easy to do
Free choice, no force at all!
You only have one blank card, no switch!
Quick reset
Gimmick made using Bicycle cards + Online instructions in English and in French.
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