Susan Foreman

Mana cost: {1}{G}
Type: Legendary Creature — Time Lord
Power / toughness: 1 / 1
Set: Doctor Who #110 (rare)
Price: $0.28 USD

If you would planeswalk, instead look at the top two cards of your planar deck, put one on the bottom of your planar deck and the other on top, then planeswalk.
{T}: Add {G}.
Doctor's companion (You can have two commanders if the other is the Doctor.)

Susan Foreman has 4 printings, first in Doctor Who (2023). EDHREC ranks it #19,216 among Commander cards. It appears most in The Fourth Doctor // Sarah Jane Smith decks (298 on EDHREC). 1 public deck on TCG runs it. It has 10 official rulings.

Legality

commander: legal
legacy: legal
vintage: legal
pauper: not legal
modern: not legal
pioneer: not legal
standard: not legal
brawl: not legal

Public decks that run Susan Foreman

Blast from the Past - Doctor Who, led by Sarah Jane Smith

Commanders that run Susan Foreman most

Deck counts from EDHREC.

The Fourth Doctor // Sarah Jane Smith: 298 decks
Ashaya's Enduring Bond: 113 decks
Reki, the History of Kamigawa: 60 decks
The Fourteenth Doctor: 48 decks
Legolas Greenleaf: 4 decks
Jamie McCrimmon: 4 decks
Graham O'Brien: 1 decks
Durnan of the Yawning Portal: 1 decks

Often played with Susan Foreman

Cards that show up in the same decks on EDHREC.

Rulings

2023-10-13: 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.
2023-10-13: 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.
2023-10-13: 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.
2023-10-13: Once the game begins, your two commanders are tracked separately. If you cast one, you won't have to pay an additional {2} the first time you cast the other. A player loses the game after having been dealt 21 combat damage from any one of them, not from both of them combined.
2023-10-13: If an effect instructs you to choose a creature type, you may choose Time Lord.
2023-10-13: Neither "Time" nor "Lord" are creature types. Some older cards were printed with the subtype "Lord," but all of those cards have updated Oracle card text that removed that type.
2023-10-13: Unlike other creature types in Magic that are each only one word, the two words "Time Lord" represent a single creature subtype. Time Lord is the only two-word creature type.
2023-10-13: If something refers to your commander while you have two commanders, it refers to one of them of your choice. If you are instructed to perform an action on your commander (e.g. put it from the command zone into your hand due to Command Beacon), you choose one of your commanders at the time the effect happens.
2023-10-13: Although Doctor's companion is a new variant of the partner ability, the rules for partner have not otherwise changed. Notably, Time Lord Doctors and cards with Doctor's companion do not interact with cards which have another partner ability.
2023-10-13: An effect that checks whether you control your commander is satisfied if you control one or both of your two commanders.