Ace, furchtlose Rebellin

Nitro-9 — Immer wenn Ace, furchtlose Rebellin, angreift, kannst du ein Artefakt opfern. Wenn du dies tust, lege eine +1/+1-Marke auf Ace, furchtlose Rebellin. Dann kämpft sie gegen bis zu eine Kreatur deiner Wahl, die der verteidigende Spieler kontrolliert.
Begleiter des Doctors (Du kannst zwei Kommandeure haben, falls der andere der Doctor ist.)

Ace, rebelle intrépide

Nitro-9 — À chaque fois qu'Ace, rebelle intrépide attaque, vous pouvez sacrifier un artefact. Quand vous faites ainsi, mettez un marqueur +1/+1 sur Ace, rebelle intrépide, puis elle se bat contre jusqu'à une créature ciblée que le joueur défenseur contrôle.
Compagnon du Docteur (Vous pouvez avoir deux commandants si l'autre est le Docteur.)

恐れなき反逆者、エース

ニトロ９ — 恐れなき反逆者、エースが攻撃するたび、あなたはアーティファクト１つを生け贄に捧げてもよい。そうしたとき、防御プレイヤーがコントロールしているクリーチャー最大１体を対象とする。恐れなき反逆者、エースの上に＋１/＋１カウンター１個を置く。その後、これはそれと格闘を行う。
ドクターのコンパニオン（もう一方がドクターであるなら、あなたは統率者２体を使用できる。）

Ace, Fearless Rebel

Nitro-9 — Whenever Ace attacks, you may sacrifice an artifact. When you do, put a +1/+1 counter on Ace, then it fights up to one target creature defending player controls.
Doctor's companion (You can have two commanders if the other is the Doctor.)

Doctor Who

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.

An effect that checks whether you control your commander is satisfied if you control one or both of your two commanders.

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 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.

If you choose no target for Ace's Nitro-9 ability, you will put a +1/+1 counter on it. However, if you choose a target and it is an illegal target as the ability tries to resolve, you won't put a +1/+1 counter on Ace. In either case, no fight will happen and no creature will deal or be dealt damage.

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.

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.

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.