Jo Grant — ruling 1

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.

Jo Grant — ruling 2

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.

Jo Grant — ruling 3

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.

Jo Grant — ruling 4

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.

Jo Grant — ruling 5

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.

Jo Grant — ruling 6

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.

Jo Grant — ruling 7

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

Jo Grant : règles, fonctionnement et interactions (MTG)

Jo Grant is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Each historic card in your hand has cycling . (, Discard that card: Draw a card.) Whenever you cycle a card, put a +1/+1 counter on Jo Grant. Doctor's companion (You can have two commanders if the other is the Doctor.)

How it works : Jo Grant

Original English text — Wizards of the Coast / Scryfall

#1October 13, 2023· Wizards of the Coast
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.
No other card is named in this ruling.
#2October 13, 2023· Wizards of the Coast
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.
No other card is named in this ruling.
#3October 13, 2023· Wizards of the Coast
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.
No other card is named in this ruling.
#4October 13, 2023· Wizards of the Coast
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.
No other card is named in this ruling.
#5October 13, 2023· Wizards of the Coast
Once the game begins, your two commanders are tracked separately. If you cast one, you won't have to pay an additional 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.
No other card is named in this ruling.
#6October 13, 2023· Wizards of the Coast
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.
No other card is named in this ruling.
#7October 13, 2023· Wizards of the Coast
An effect that checks whether you control your commander is satisfied if you control one or both of your two commanders.
No other card is named in this ruling.