Why does it matter? Can't you watch magic and appreciate it for it's performance value without having to imediately rush out to the internet to learn how it's done?
You're a magician right? How would YOU do it?
...Not like you're going to be adding this to your act anytime soon.
This is not the first card trick in space. That was decades ago, pre shuttle.
Does anyone know the date this clip was filmed?
Richard Garriott and Greg Chamitoff performed the first full magic show in space and Richard produced the first sci-fi movie to be filmed in space. They also did a lot of juggling.