Can Commander Decks Have Sideboards?
The Commander Format Does Not Use a Sideboard; Cards That Take Other Cards from Outside the Game (Such as Wishes) Must Be Discussed with the Playgroup Before...
The Commander format does not use a sideboard; cards that take other cards from outside the game (such as Wishes) must be discussed with the playgroup before being put in the deck. However, a player may use a companion in addition to their 100-card deck, provided their deck meets the companion's requirements.
Can a commander deck have a companion?
Each Commander deck may include a chosen companion. It starts outside the game and doesn't count as one of your 100 cards. Just like the rest of your deck, your commander must follow the deck-building rule if you're going to use a companion.
Does sideboard count as starting deck?
Rulings. Your companion begins the game outside the game. In tournament play, this means your sideboard. In casual play, it's simply a card you own that's not in your starting deck.
Alexander Ross has covered the video game industry for a decade, writing deep dives on game design, esports tournaments, VR developments, and gaming culture.
