I think if you could rig your camera up Eye of Judgement style (yeah, remember that one from the early days of Eye Toy?) it could work. Magic and Sentinels are a little easier because there are no spatial relationships between the playing pieces, whereas in MW, your friend would probably need to have a copy of your 'book put together or proxied to make the logistics flow "more smoothly." I'm sure you could manage without actually placing opponent cards out on your board and just playing based on the Skype image, but my head has a hard time wrapping around looking at one thing and making moves where those other things don't exist. Just my two cents, though. And I totally feel you, most of my gamer friends live across the country, so if you do get it working, let me know how!