"There will be no sacrifice this afternoon, Doctor. Or ever again."

„Heute Nachmittag wird sich niemand aufopfern, Doctor. Und auch sonst nie wieder."

Barbara Wright

Geschichtslehrerin — Sagen, die du kontrollierst, haben Überblättern. (Sowie eine Sage ins Spiel kommt, wähle ein Kapitel und beginne mit so vielen Sagenmarken. Übersprungene Kapitel werden nicht ausgelöst.)
Begleiter des Doctors (Du kannst zwei Kommandeure haben, falls der andere der Doctor ist.)

« Il n'y aura pas de sacrifice cet après-midi, Docteur. Il n'y en aura plus jamais. »

Professeur d'histoire — Les sagas que vous contrôlez ont la lecture rapide. (Au moment où une saga arrive sur le champ de bataille, choisissez un chapitre et commencez avec autant de marqueurs « sapience ». Les chapitres passés ne se déclenchent pas.)
Compagnon du Docteur (Vous pouvez avoir deux commandants si l'autre est le Docteur.)

「ドクター、生け贄なんて認めません。今日の午後だけではありません、未来永劫にです。」

バーバラ・ライト

歴史の先生 — あなたがコントロールしているすべての英雄譚は先読を持つ。（英雄譚が戦場に出るに際し、章を選び、それに等しい数の伝承カウンターで始める。飛ばされた章は誘発しない。）
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。）

History Teacher — Sagas you control have read ahead. (As a Saga enters, choose a chapter and start with that many lore counters. Skipped chapters don't trigger.)
Doctor's companion (You can have two commanders if the other is the Doctor.)

Doctor Who

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.

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.

As a Saga with read ahead enters the battlefield, its controller chooses a number from one to that Saga's greatest chapter number. The Saga enters the battlefield with the chosen number of lore counters. Neither choosing the number nor putting the counters on the Saga use the stack, and neither can be responded to.

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.

Having multiple instances of read ahead doesn't cause anything unusual to happen. It functions the same way as having one instance of read ahead.

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.

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.