What penalty is typically issued for accidentally shuffling an opponent's deck?

When a player accidentally shuffles an opponent's deck, the most common penalty issued is a Warning. This action is generally viewed as an infraction related to maintaining the integrity of the game, and it reflects a level of seriousness that requires the judge to intervene but does not warrant more severe penalties. Warnings serve to remind players to be more mindful of their actions during a match and to uphold good sportsmanship.

In this situation, the player did not intentionally alter their opponent's deck or engage in any form of cheating; hence, a more severe penalty like a Game Loss or Match Loss would not be appropriate. An Immediate Disqualification is reserved for direct violations of tournament rules that are deemed serious enough to warrant the player being removed from the event altogether. Since accidental shuffling does not fall into this category, a Warning is the correct and appropriate response. This penalty helps to maintain a fair playing environment while also allowing players to learn from their mistakes.