Duplicate Sealed
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Duplicate Sealed is an unofficial Magic: The Gathering format.
Duplicate Sealed is a Limited Sealed format. However, instead of using random packs, everyone in a Duplicate Sealed tournament recieves the exact same card pool.
Duplicate Sealed has been used many times at the Magic Invitational. When played at the Invitational, the card pools often include cards supplied by Magic R&D (especially Mark Rosewater) that are created just for the Invitational and have never been seen before by the players.