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The magician shows six Christmas cards in his hand, then removes three Christmas cards and throws them into a gift bag. He counts again to show he still has six Christmas cards in his hand. Then he repeats the trick several more times. He still has 6 Christmas cards in his hand.
This is based on the classic self-working version of the Classic Six Card Repeat and this PDF download includes construction info to make your own set as well as the full presentation.