If you have two commanders with the partner ability in the command zone, Command Beacon's effect puts one of your choice into your hand, not both.
10-11-2020
wotc
If your commander isn't in the command zone (or you don't have a commander) as the last ability resolves, nothing happens.
10-11-2020
wotc
If you cast a commander from your hand, the commander tax doesn't apply. Additionally, that casting won't add to commander tax if you later cast the commander from the command zone.
08-11-2016
wotc
If you have two commanders with the partner ability in the command zone, Command Beacon's effect puts one of your choice into your hand, not both.
04-11-2015
wotc
If your commander isn't in the command zone (or you're not playing Commander) as the last ability resolves, nothing happens.
04-11-2015
wotc
If you cast a commander from your hand, the additional cost based on the number of times you've cast it from your command zone (sometimes referred to as the "commander tax") doesn't apply. Additionally, that casting won't add to the tax if you later cast the commander from the command zone.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.