A TCG created by Richard Garfield, but now owned by Wizards of the Coast. Although commonly associated with nerds, this game has been known to be played by anyone. The game is meant to symbolize powerful wizards doing battle by summoning monsters and the like.
Each player starts with 20 life, a hand of 7 cards, and must have a deck of at least 60 cards. A player can die by loosing all his/her life, or by being forced to draw a card when she has no cards left in her deck, or by the bullshit card Door to Nothingness. You win the game by killing off all opponents, or by cards that say you win when you meet a certain prerequisite. Many cards are banned or restricted (only one is allowed per deck), usually the older cards, or many of the cards from the mirrodin set, because of the hundreds of instant-win combos. The game is not entirely based on card supremecy; a particulaly skilled player could easily win with a premade deck.
I get thrown out of Friday Night Magic: The Gathering tournements because of my Mirrodin-block Krark-Clan Ironworks deck (now featuring 17 instant-win combos).
Prices shown in USD.