Vanguard cards remain in the command zone throughout the game. They’re not permanents. They can’t be cast. If a vanguard card would leave the command zone, it remains in the command zone.
July 23, 2021 · Adventures in the Forgotten Realms
Scheme cards remain in the command zone throughout the game, both while they’re part of a scheme deck and while they’re face up. They’re not permanents. They can’t be cast. If a scheme card would leave the command zone, it remains in the command zone.
April 22, 2021 · Strixhaven
At the start of a game, before decks are shuffled, each player may put any number of conspiracy cards from their sideboard into the command zone. Conspiracy cards with hidden agenda are put into the command zone face down. (See rule 702.106, “Hidden Agenda.”)
May 3, 2019 · War of the Spark
At the start of a game, before decks are shuffled, each player may put any number of conspiracy cards from their sideboard into the command zone. Conspiracy cards with hidden agenda are put into the command zone face down. (See rule 702.105, “Hidden Agenda.”)
January 25, 2019 · Ravnica Allegiance
At the start of a game, before decks are shuffled, each player may put any number of conspiracy cards from their sideboard into the command zone. Conspiracy cards with hidden agenda are put into the command zone face down. (See rule 702.105, "Hidden Agenda.")
April 27, 2018 · Dominaria
At the start of a game, before decks are shuffled, each player may put any number of conspiracy cards from their sideboard into the command zone. Conspiracy cards with hidden agenda are put into the command zone face down. (See rule 702.105, “Hidden Agenda.”)
June 1, 2014 · Conspiracy
At the start of a game, before decks are shuffled, each player may put any number of conspiracy cards from his or her sideboard into the command zone. Conspiracy cards with hidden agenda are put into the command zone face down. (See rule 702.105, “Hidden Agenda.”)