Command Beacon

Type: Land
Set: Legendary Cube Prize Pack #136 (uncommon)

{T}: Add {C}.
{T}, Sacrifice this land: Put your commander into your hand from the command zone.

Command Beacon has 17 printings, first in Commander 2015 (2015). EDHREC ranks it #183 among Commander cards. It appears most in Teval, the Balanced Scale decks (22,948 on EDHREC). 5 public decks on TCG run it. It has 6 official rulings.

Legality

commander: legal
legacy: legal
vintage: legal
pauper: not legal
modern: not legal
pioneer: not legal
standard: not legal
brawl: legal

Public decks that run Command Beacon

Federation Fleet - Star Trek Commander, led by Jean-Luc Picard, Luminary
Most Wanted - Outlaws of Thunder Junction Commander, led by Olivia, Opulent Outlaw
Odds and Ends - Secret Lair Commander, led by Yennett, Cryptic Sovereign
Sultai Arisen - Tarkir: Dragonstorm Commander, led by Teval, the Balanced Scale
Swell the Host - Commander 2015, led by Ezuri, Claw of Progress

Commanders that run Command Beacon most

Deck counts from EDHREC.

Often played with Command Beacon

Cards that show up in the same decks on EDHREC.

Rulings

2015-11-04: If your commander isn't in the command zone (or you're not playing Commander) as the last ability resolves, nothing happens.
2015-11-04: 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.
2016-11-08: 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.
2020-11-10: 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.
2020-11-10: If your commander isn't in the command zone (or you don't have a commander) as the last ability resolves, nothing happens.
2020-11-10: 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.