Color Identity: The deck cannot include any cards that feature mana symbols not found on the Commander, e.g."Commanderness" is an inherent quality of the Commander: it can neither be removed nor copied, and a Commander is still a Commander even if that Commander is being controlled by another player. Commander/General: The deck must include a Commander, also known as a general, which must be a Legendary Creature.There are four rules for building a commander deck: It is characterized by the use of a Commander, or General, and the 100-card singleton deck. Originally and alternatively known as Elder Dragon Highlander, or EDH, Commander is a multiplayer Constructed format of the Magic: the Gathering trading card game.