What must a player do if they realize they have a misreported deck list?

When a player realizes that they have misreported their deck list, it is essential for them to notify a judge immediately. This action is crucial because the integrity of the tournament relies on accurate deck reporting. Misreporting can lead to a number of issues, including unfair advantages, and it is the responsibility of the player to ensure that the correct information is available.

By contacting a judge, the player opens the possibility for the issue to be addressed properly according to the tournament rules. The judge can then assess the situation, determine if any penalties are necessary, and decide how to rectify the mistake within the context of the tournament. The other choices do not align with the process outlined in the tournament rules, as ignoring the error, dropping from the event, or attempting to change the deck without assistance would not maintain the fairness of the game.