If a player finds out their decklist is incorrect, what should they do?

The appropriate action when a player discovers their decklist is incorrect is to inform a judge immediately. This is important because decklist infractions are taken seriously in tournament play, and the rules dictate that players must comply with the format's requirements. Notifying a judge ensures that the infraction can be assessed appropriately and resolved according to the tournament rules.

Players are discouraged from attempting to address the issue themselves or hoping it will not become a problem since this could lead to additional infractions or misunderstandings about the situation. Adjusting the decklist on their own during the tournament or waiting until after the event to change it would not align with the expectation of transparency and fair play that governs competitive environments. Keeping the lines of communication open with a judge is paramount to maintaining the integrity of the tournament.