Legendary Creature â Human Ally
Whenever Bruse Tarl, Boorish Herder enters the battlefield or attacks, target creature you control gains double strike and lifelink until end of turn.
Partner (You can have two commanders if both have partner.)
Anthony Palumbo INTERVIEW
To have two commanders, both must have the partner ability as the game begins. Losing the ability during the game doesnâ€™t cause either to cease to be your commander.
The triggered ability triggers both when Bruse Tarl enters the battlefield and whenever it attacks. You donâ€™t have to choose only one.
Once the game begins, your two commanders are tracked separately. If you cast one, you wonâ€™t have to pay an additional the first time you cast the other. A player loses the game after having been dealt 21 damage from one of them, not from both of them combined. Command Beaconâ€™s effect puts one into your hand from the command zone, not both.
If your Commander deck has two commanders, you can only include cards whose own color identities are also found in your commandersâ€™ combined color identities. If Akiri and Silas Renn are your commanders, your deck may contain cards with white, blue, black, and red in their color identity, but not green.
Both commanders start in the command zone, and the remaining 98 cards of your deck are shuffled to become your library.
An effect that checks whether you control your commander is satisfied if you control one or both of your two commanders.