That's a tremendous feat of planning! The 10 cards that were dealt to the volunteer were marked and are intentionally placed as the 10 cards on the top of the deck; when the volunteer selected a card, the magician knows exactly which card it is. As the magician explains that his deck is made of 'number cards', he intentionally rearranges his deck to specifically select and arrange the cards for that number. The rest is evident.

Hmmm, maybe Deep Thought was correct

I can see that he is counting the cards and splitting the deck, and could do so based on the card chosen, but I still don't see how he knows the chosen card is 42, when they are shuffled by the player...

The purchasing site mentions "no sleight-of-hand required".

amazin enough for me

what would really have impressed me would be if he said "okay, last night, while you were asleep, take your pants off and spread eagle for me please, yes that's right, last night while you were asleep, we had a tattoo artist come into your bedroom and only just so happened to tattoo number 4 on your left buttcheek, and the number 2 on your right buttcheek" *david blaine stare*

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