Nice Card to Box, simple 17 minute video which gives you pretty much all the info you need. If you
don't know what a Mercury fold is, learn it, you'll need it for other things down the road and it's
not that hard just have an old deck of cards to practice on. That's honestly the only hard part of
this trick, and that's not that hard at all. Beginner could do with about an hours practice
learning the fold. An intermediate will have it in five minutes.