

Once a companion is brought into the game in this manner, it remains in the game until the game ends.įrom the Comprehensive Rules (September 8, 2022- Dominaria United) This special action does not use the stack and cannot be responded to. Under the new Companion rules, once per game, any time a player can cast a sorcery, the player can take a special action and pay to put their chosen companion from outside the game into their hand. and won't return to the sideboard until the game ends. Casting the companion this way brings it into the game for good, after which it can be destroyed, exiled, returned to the hand, shuffled into the library, etc. Doing so follows all the normal rules for casting a creature spell, so a player can normally do so only during their main phase if they have priority and the stack is empty. Under the original Companion rules, once per game, a player can cast their chosen companion from their sideboard.
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The rules for how to bring your chosen companion into the game were introduced with the release of Ikoria: Lair of Behemoths on Apand updated on June 1, 2020. (If you're playing casually without sideboards, it's just in your collection outside the game, but all other rules still apply.) Just before the game begins, players in turn order reveal their chosen companions to all players.

This means it doesn't count toward meeting the minimum deck size in the format you're playing, but in Constructed formats, it does count toward your sideboard size. That chosen companion doesn't start in your main deck rather, it starts outside the game. You may have up to one chosen companion for each game. If your starting deck follows that rule, then the creature can serve as your chosen companion. The companion ability lists a deckbuilding rule.
