Magic: The Gathering

Magic: The Gathering, p.n. collectible card game, created by Richard Garfield for Wizards of the Coast, and well past its Tenth Edition; M:TG is available in nine languages and sold in 52 countries, and is played by six million people worldwide. See also Magic: The Addiction, Gamer Crack, bruise, smurf. [GJ1]
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Addendum: Magic has now been a part of gaming for 15 years. As if you needed another reason to feel old.