The Commander variant includes the following specification for winning and losing the game. All other rules for ending the game also apply. (See rule 104.)
January 16, 2016 · Oath of the Gatewatch
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.
February 1, 2014 · Born of the Gods
A player may cast a commander he or she owns from the command zone. A commander cast from the command zone costs an additional {2} for each previous time the player casting it has cast it from the command zone that game.
September 30, 2011 · Innistrad
A player may cast a commander he or she owns from the command zone. Doing so costs that player an additional {2} for each previous time he or she cast that commander from the command zone that game.
June 17, 2011 · Commander 2011
A player may cast a commander he or she owns from the command zone. Doing so costs that
February 4, 2011 · Mirrodin Besieged
A player may cast a commander he or she owns from the command zone. Doing so costs that player an additional {2} for each previous time he or she cast that commander from the command zone that game.
October 1, 2010 · Scars of Mirrodin
If a general would be put into its owner’s graveyard from anywhere, that player may put it into
February 1, 2010 · Worldwake
If a general would be put into its owner's graveyard from anywhere, that player may put it into the command zone instead.