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Magic is a game of rules and boundaries. In a world of infinite possibilities, no one player knows exactly how to deal with every possible situation. You may think you understand "the stack", but one day you'll run across a card that just doesn't seem to jive with your scheme about how the stack should properly unfold. Check out the Magic Golden Rules at Gatheringmagic.com.
If you're looking to get better at building decks and choosing them for tournaments, here are the top 8 ways to improve your deck building shared by Magic.wizards.com.