I gotta say, if that was impromptu, I would buy it in an instant. The idea is great. The little pushing of the top half of the deck is a tad suspicious, but the ending fixes that up.
Also, it is very easy to see that the card is only a few cards from the top when you place it in. But when you turn the deck face down the card seems on the bottom. A little fishy, no?
There were a couple of things you could have improved on that would be even more convincing. I can't say much without possible exposure so hit me up on PM.
The idea behind it was very good. For the presentation you could've, like others have said, add a few extra subtleties. Overall a good performance I'd give it a 4/5.
Thanks for all of the constructive responses, I really do appreciate it. I see were I could have improved, so expect an updated version soon. Thanks again.