Rules glossary

↑ Section 702. Keyword Abilities

702.139 Companion ☆

• ☆ 702.139a 🔗 Companion is a keyword ability that functions outside the game. It’s written as “Companion—[Condition].” Before the game begins, you may reveal one card you own from outside the game with a companion ability whose condition is fulfilled by your starting deck. (See rule 103.2b.) Once during the game, any time you have priority and the stack is empty, but only during a main phase of your turn, you may pay {3} and put that card into your hand. This is a special action that doesn’t use the stack (see rule 116.2g). This is a change from previous rules. (refs: 103.2b, 116.2g)
• ☆ 702.139b 🔗 If a companion ability refers to your starting deck, it refers to your deck after you’ve set aside any sideboard cards. In a Commander game, this is also before you’ve set aside your commander.
• ☆ 702.139c 🔗 Once you take the special action and put the card with companion into your hand, it remains in the game until the game ends.
• ☆ 702.139d 🔗 Cards can enter Commander games from outside the game via the companion special action.

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