The Doctor's companion ability allows you to have two commanders if one has the ability and the other is a legendary creature that is a Time Lord Doctor and has no other creature types. Creatures with the changeling ability, for example, can't be a second commander this way.
Susan Foreman
Both commanders start in the command zone, and the remaining 98 cards (or 58 cards in a Commander Draft game) of your deck are shuffled to become your library.
If your Commander deck has two commanders, you can include only cards whose own color identities are also found in your commanders' combined color identities.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Wangjie Li
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