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Currently, match structure at a
Magic tournament is this: Play best-2-out-of-3, unless you run out of time. Except 2HG and other multiplayer formats that go long, in which case you play 1 game, until time. Or if it's a feature match at the end of a big tournament, then you play to best-3-out-of-5.
The winner gets 3 points, and the loser 0. Or if it's a draw, 1 each.