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Step 1
Select four cards from a red deck and four from a blue deck. The illusion involves your audience thinking that the cards are from the same deck, so the faces need to appear identical and all of the cards need to be different.
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Step 2
Stack the deck so that the red and blue backs are alternating. Don't show your audience the backs of the cards. Instead, show them only the faces to begin with.
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Step 3
Ask an audience member to touch one of the cards. Pull that card out and set it on the table face up. It's important that you remember the color of that card's back--if you have to, sneak a peak at the back, but don't let your audience see it.
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Step 4
Prepare to show the audience that the deck of cards is entirely composed of the opposite color--so if the chosen card is a red back, you're going to show the audience only the blue-backed cards. Do this by flipping the deck over so that the backs are on top (if the bottom card is the opposite color), then flipping the deck over and showing the face of the next card, then showing the audience the back of the third card.
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Step 5
Adapt to the bottom card being the same color as the chosen card by simply shuffling it to the top of the deck as you talk, or cutting the deck and placing a card you know is the opposite color on the bottom. Then flip the deck over and show the back, flip to show the next face, and flip to show the third back, just like you would have.
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Step 6
Reveal to your audience that even though the deck is blue, the card the audience member has chosen is red (or vice versa) by flipping the chosen card over after you've gone through and shown the audience your "whole" deck.
