When you see this effect performed, you will be blown away. Even though a card turns over in the deck 3 times in a row, you will never see the move no matter how closely you watch. This is one of those rare effects that look absolutely impossible but don't require weeks of practice. You will look like a true card mechanic while relaxing and entertaining your audience. There is really only one move in this effect and once you learn it (in about one minute) you will be able to create this magic moment. I sat three feet from Henry watching this and never figured out what was going on. I kept thinking I was missing something, but the problem was I kept looking for a move when it had already happened long before I realized I should have been paying attention.

The deck could be examinable casually, but a thorough examination may spoil things. If nothing else, you can definitely relax if someone grabs the deck and says "Let me see that". However, I wouldn't let them study it forever.