About the change, I think I should note here that this trick is better to be done with few people, cause it has some angle issues. However, this trick will happen in front of the spectators' face, so people won't be standing behind your back, or above you anyway.
The method is easy, suitable for even beginner, but the effect is like the advance level of magic. Also, this is an impromptu trick, you start and end clean, you can even hand them the card and the deck after the trick is done.
For this trick, I'd like to give it 10 stars out of 5. Awesome!
I love the creativity of Cartier, and you can do it after you watch the tutorial. Why? Because the tutorial is clear and easy understand.
Cartier always becomes a hot topic after my performance. Everyone thinks it's real magic. You should not miss it.