What is Weiss Schwarz? I've been seeing this around the place, but for different series (which have nothing to do with each other like Madoka and Railgun). From what I can gleam off descriptions it's some sort of card game, but the different anime series is confusing me because when I think "Anime Card Game" I think Yu-Gi-Oh, Duel Masters, Bakugan, etc.
Weiß Schwarz is a Japanese two-player dueling collectible card game created by Bushiroad, based around (and in collaboration) with various anime series.

The game is separated into two factions Weiß-side and Schwarz-side, which are German for "white" and "black," respectively. 

Here is a better video on how to play the game: http://www.youtube.com/watch?v=SXzMtFp_ZN0