All backs are pretty and different. The spectator will find "twin cards" with the same back ! Then all the cards will have same faces !
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The magician shows a pack of cards and shuffles it and takes two cards for himself. He then asks a member of the audience to tell a number between ten and twenty. The magician then deals the number of cards told and places one of his cards on top of the dealt pile to mark the selected card.
He then repeats with another member of the audience. When the magician turns over the selected cards they match the cards the magician had taken for himself, not only do the faces match, but also the backs match.
The magician then turns over the cards to show that the rest of the cards have different backs and different faces. A excellent close-up trick.