Scene
A mirror shop.
Sketch
A normal person walks in front of different mirrors only to discover himself to be holding different object in each one. He is holding a pen in one mirror and we see him spinning it, manipulating it in different ways. As he walks from mirror to mirror, the individual watches himself manipulate objects in ways he has never doomed possible.
The sequence shows both the person in reality and the one in the mirror (but not all of the time). Better to show snippets of both and through cinema to make it clear that it is the mirror we are watching when there are performances.
Then you get to the cardistry mirror.
You can make this very funny by showing the person from the mirror first and then showing how the one from reality is actually moving.
Or you can take this down the serious road and when we see the person in reality he really is performing cardistry moves but without any deck in his hand. Air-Cardistry.
Ending
The shop owner asks him if he wants to buy a mirror. The character looks at the owner, then back at the mirror.
During the credits scene (which roll down on the right) we see the individual sitting on a chair and practicing in front of the mirror, but he got cards in his hands. The person in the reflection of the mirror is the one with no hands. Like this, the watcher has been transported on the other side of the mirror by the end of the video.