I love this game. The game consist of a set of laws and with each card you break those laws to damage your opponent. The theme is of fantasy. The only problem is that it gets expensive, they keep adding new abilities that only hurts the games, and it's played by teenagers.
I love magic. However, it feels like as time goes on the new cards become more and more powerful, thus making older collections less useful. An awesome deck from 10 years ago doesn't compare to a mediocre deck from today. That makes it pretty expensive to keep up.
Allows for almost infinite creative variety. Constructing a strong deck feels a bit like programing a computer using a vast probabilistic language. It is also fun to play the program. Cons: Expensive (unless one restricts the cards allowed or, perhaps better, allows proxy cards) and complicated, ever-evolving rules (unless one does not really care exactly how the game works at a time).