EDH-Official Commander Rules

**Daquinus** Mier 18 Sept 2013, 10:14

Philosophy

Commander is designed to promote social games of magic.
It is played in a variety of ways, depending on player preference, but a common vision ties together the global community to help them enjoy a different kind of magic. That vision is predicated on a social contract: a gentleman's agreement which goes beyond these rules to includes a degree of interactivity between players. Players should aim to interact both during the game and before it begins, discussing with other players what they expect/want from the game.
House rules or "fair play" exceptions are always encouraged if they result in more fun for the local community.

Deck Construction Rules

Players must choose a legendary creature as the "Commander" for their deck.
Players may choose any legendary creature as their Commander, although some choices may be met with disapproval by other players. Two players in the same game may choose the same Commander, and other players may include that card in their Deck even if it's not their Commander. Commanders are subject to the Legend rule just like any other legendary creature; multiple copies of the same creature (whether Commander and non-Commander) will all be put into the graveyard (or command zone) as a state based effect.
The Commander is the principle around which the deck is built. It is more easily available than other cards in the deck, and decks will ususally want to leverage their Commander's strengths in their plans. It is not, however, guarenteed to be available at every point in the game so EDH decks should be able to function without it for a time.
A deck's commander is also known as its "General" for historical reasons.

A card's colour identity is its colour plus the colour of any mana symbols in the card's rules text. A card's colour identity is established before the game begins, and cannot be changed by game effects.
The Commander's colour identity restricts what cards may appear in the deck.
Cards in a deck may not have any colours in their identity which are not shared with the commander of the deck. (The identity of each card in the deck must be a subset of the General's)
Lands whose type includes swamp, island, plains, forest and/or mountain (e.g.: basic lands, shocklands, dual lands, Shadowmoor special-basics, etc) DO contain the corresponding mana symbol(s) as per CR 305.6. As such, while they are "colourless" they do have a colour identity and may not appear in a deck unless the Commander is of the appropriate identity.
While hybrid mana symbols may be played with either colour mana, they contribute both colours to the card's colour identity. Therefore they may only be played with a Commander whose identity includes ALL of the hybrid symbols' colours.
Basic land words (swamp, forest, etc) in the text box of a card do NOT represent a coloured mana symbol. They are not restricted to Commander of the same colour identity.
Reminder text is not included in the colour identity of a card.
A deck may not generate mana outside its colours. If an effect would generate mana of an illegal colour, it generates colourless mana instead.
A Commander deck must contain exactly 100 cards, including the Commander.
With the exception of basic lands, no two cards in the deck may have the same english name.
Commander is played with vintage legal cards, with some exceptions.

Play rules

The start of game procedure for Commander is as follows:
Players announce their choice of Commander and move that card to the command zone.
Players may then sideboard if the optional rules for sideboards are being used.
Each player draws a hand of seven cards.
Players may mulligan, using the modified "Partial Paris" method.

Partial Paris Mulligan rule
Because Commander games are long and usually not played in multigame matches, the format uses a modified mulligan rule designed to alleviate mana-light hands without significantly increasing the odds of finding individual cards. This is also known as the "Brittany" mulligan rule.
In turn order, players may exile (face down) some or all of the cards in their hand.
Each player then draws one less card from their deck than the number they exiled.
Players who exiled at least one card may return to step 1 and repeat the process, drawing one less card each time.
Players shuffle all exiled cards into their deck.
It is worth noting that even with this form of mulligan, decks playing an insufficient number of mana sources will routinely draw poor hands or insufficient mana as the game progresses.

Being a Commander is not a characteristic[MTG CR109.3], it is a property of the card. As such, "Commander-ness" cannot be copied or overwritten by continuous effects, and does not change with control of the card. Examples
Examples: A Body Double copying a Commander in a graveyard is not a Commander. A Commander which is affected by Cytoshape, or is face down, is still a Commander.
If a player has been dealt 21 points of combat damage by a particular Commander during the game, that player loses a game. Details
This is an additional state based effect.
Commander Damage is cumulative throughout the game; nothing can reduce the amount of damage a Commander has previously done to a player.
Because it is a property of the card and not a characteristic of the game object, a card is still the same Commander even if it leaves the field and returns.
While effects can raise a player's life total, it doesn't reduce the amount of damage previously taken from a Commander. (eg: Beacon of Immortality)
Conversely, combat damage can be reduced, prevented, or replaced as it is taken, in which case it was never dealt and doesn't count towards the total taken from that Commander. (eg: Fog or Captain's Maneuver)
Commander Damage is specific to each Commander/Player pairing, not combined across all Commander.
A player can lose if he or she is dealt 21 points of combat damage by his or her own Commander (ie: under someone else's control).

While a Commander is in the command zone, it may be cast. As an additional cost to cast a Commander from the command zone, its owner must pay {2} for each time it was previously cast from the command zone. (ie: Olivia Voldaren costs 6BR to cast for the third time.) Details
If a Commander would be put into a graveyard or exile from anywhere, its owner may choose to move it to the command zone instead. Details
If a card is put into the exile zone face down from anywhere, and a player is allowed to look at that card in exile, the player must immediately do so. If it's a commander owned by another player, the player that looked at it turns it face up and puts it into the command zone.
Players begin the game with 40 life.
Commanders are subject to the Legend rule; a player cannot control more than one legend with the same name.
Abilities which refer to other cards owned outside the game (Wishes, Spawnsire, Research, Ring of Ma'ruf) do not function in Commander unless the optional sideboard rule is in use. If sideboards are used, wishes and similar cards may retrieve sideboard cards.