What should players do if they realize they have incorrectly registered a card?

When players realize they have incorrectly registered a card, the correct action is to inform a judge immediately. This is essential because tournament integrity relies on accurate registration of cards. By notifying a judge, players ensure that the situation can be addressed according to the tournament rules, minimizing potential penalties or complications that may arise from an uncorrected error.

Correctly reporting the situation allows the judge to assess the error—whether it affects gameplay and how to handle it within the framework of the tournament rules. Keeping the integrity of the game intact is paramount, and addressing mistakes promptly helps maintain that standard. This approach also serves to protect both players in the match from inadvertently breaking rules or facing consequences due to an oversight.

In contrast to the other options, attempting to exchange a card mid-match disregards the established procedures for handling registration issues and could lead to unfair game states or disputes. Waiting until the tournament concludes would delay the resolution of the issue and could exacerbate the situation. Continuing to play without mentioning it not only violates integrity but could also result in significant repercussions for both players involved if discovered later.