What might happen if a player shuffles an opponent's deck repeatedly?

When a player shuffles an opponent's deck repeatedly, it can be considered as an inappropriate action that disrupts the flow of the game and affects the integrity of the match. The correct answer reflects the fact that the player may initially receive a warning for this behavior, indicating that they are breaching the rules of conduct expected at a sanctioned event. This warning serves as a caution, alerting the player that their actions are not within the boundaries of acceptable play.

However, the consequences can escalate if the behavior continues or if there are additional infractions. Thus, the rules are designed to be progressively more severe for repeated or ongoing misconduct, which may lead to more severe penalties beyond just a warning. This progressive enforcement encourages players to maintain proper conduct during their matches.

In contrast, the other options imply either overly severe consequences without context, such as an automatic game loss for a single instance, or suggest that there are no repercussions at all, which is not accurate. It is crucial for players to understand that maintaining respect for the game and their opponents includes following proper procedures regarding handling game components like decks.