I love this effect. It's a fooler, and a lot of fun. But don't be misled by the trailer. It isn't
as clean as presented. In fact, the deck has to come into contact with the bottom of the envelope.
Not exposure, because that is what the spectators will see. Like I said, though, I still love this
effect and highly recommend it. It's a very well made prop, ingenious in design. But the handling
is not what you see in the demo.
Your comments are WRONG! The deck DOES NOT have to come near the bottom of the envelope or anywhere near it.
In the trailer a gamblers cop is used. If you know zero about card magic/sleight of hand, don't make statements that you think are true, because you are WRONG!