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.
Viconia, Drow Apostate
If you control a Background that grants an ability to commander creatures you own, and you own more than one commander creature, each of them will have that ability.
Choose a Background is a variant of the partner ability. You may have two commanders if one of them is a legendary creature with the choose a background ability and the other is a legendary Background enchantment. Backgrounds and cards with choose a Background do not interact with cards which have any other partner ability.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Justine Mara Andersen
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