CR / RELEASE 2026-07-24
Rule 358
5. Check legality.
Rule hierarchy
Direct children
358.1Check that all chosen targets are legal.358.2Check that all costs were paid.358.3Check that the outcome of the effect of this card being played would not create an illegal state. Example: Check that a spell's execution does not create a state where a Battlefield has Units controlled by 3 different players.358.4Check that the card has the appropriate permissions to be played at this timing. Example: If the state is Showdown Closed and the card was the one that Closed the state, ensure that it has [Action] or [Reaction]. Example: If the state is Closed and the card wasn’t the one that Closed the state, ensure that it has [Reaction].358.5If any of the above checks fail, the actions taken in this process are undone and the action is cancelled.