The Commander format is all about picking your hero and building a deck around them. In this casual, multiplayer format, you choose a legendary creature to serve as your commander and build the rest of your deck around their color identity and unique abilities.
For Commander Sealed, unlike constructed games—where you arrive with a strategically created deck—Sealed games have you build a new deck from six unopened booster packs. Additionally, you may add as many basic lands (Plains, Islands, Swamps, Mountains, and Forests) as you’d like, even if they weren’t in the booster packs you opened.
Unlike regular Commander you may add multiples of the same card to your deck and each deck must have at least 60 cards along with a Legendary creature which you will use as your Commander. The Commander counts towards the 60 card deck minimum.
This format is generally meant for increments of four players, and the seating arrangement should be at random