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It’s an Eternal format, there are no extensions rotation. Exactly like with Vintage and Legacy, all black or white borders editions are legal.
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Singleton format: except for basic lands, you cannot have more than 1 of each card.
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A deck must contain exactly 99 cards and 1 commander, there is no sideboard. (Leviathan Commander and Duel Commander)
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The commander must be a legendary creature card. It starts the game in the command zone and can be cast as if it was in your hand. If it has to move frome a zone to another one, its owner can decide to place him back to the command zone. It will then cost 2 more generic mana to cast for each time it was already cast from the command zone.
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Each card has a color identity which corresponds to the mana colors in its cost and rule text. You can only have cards with a color identity included in your commander’s identity in your deck.
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