Donna Noble

Mana cost: {3}{R}
Type: Legendary Creature — Human
Power / toughness: 2 / 4
Set: Doctor Who #382 (rare)
Price: $1.08 USD

Soulbond (You may pair this creature with another unpaired creature when either enters. They remain paired for as long as you control both of them.)
Whenever Donna Noble or a creature it's paired with is dealt damage, Donna Noble deals that much damage to target opponent.
Doctor's companion (You can have two commanders if the other is the Doctor.)

Donna Noble has 4 printings, first in Doctor Who (2023). EDHREC ranks it #11,080 among Commander cards. It appears most in Wayta, Trainer Prodigy decks (2,637 on EDHREC). 1 public deck on TCG runs it. It has 9 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 Donna Noble

Timey-Wimey - Doctor Who, led by Rose Tyler

Commanders that run Donna Noble most

Deck counts from EDHREC.

Wayta, Trainer Prodigy: 2,637 decks
The Tenth Doctor // Rose Tyler: 1,153 decks
Piru, the Volatile: 530 decks
Nin, the Pain Artist: 436 decks
Ashling the Pilgrim: 198 decks
Ben-Ben, Akki Hermit: 137 decks
Archangel Avacyn // Avacyn, the Purifier: 133 decks
Strax, Sontaran Nurse: 119 decks

Often played with Donna Noble

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: 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: If Donna is paired with another creature and they are both dealt damage at the same time, the second ability triggers twice.
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: 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: 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: An effect that checks whether you control your commander is satisfied if you control one or both of your two commanders.
2023-10-13: Donna's ability triggers when either creature is dealt damage even if one or both were dealt lethal damage.