Magic is the original and most popular collectable card game. You play the role of a Planeswalker, a powerful sorcerer that uses land for power. Cards represent spells that you cast. The goal is to kill off the opposing Planeswalker(s). If you want to start playing Magic, buy a Portal fixed starter deck. If you are already a somewhat advanced player, check out the following stuff.
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Magic: The Gathering, all cards, names, and other stuff copyright Wizards of the Coast. All art is copyrighted by the artists. (I'm pretty sure)