What is a potential consequence for failing to inform a judge about an illegal deck?

When a player fails to inform a judge about an illegal deck, it can result in a Game Loss for the player. This is because maintaining a legal deck is crucial to the integrity and fairness of tournament play. When a player realizes that their deck is illegal but does not report it, they are effectively disregarding the rules that govern the game. The policy is in place to ensure that all players compete on equal footing, and detecting an illegal deck is the responsibility of both the player and the judge.

Therefore, if a player is aware of their illegal deck and chooses not to disclose it, the consequences reflect the seriousness of that oversight. A Game Loss serves as a penalty to both discourage such actions and uphold the tournament standards, thereby impacting the player’s standing in the event.

The other possibilities, such as no penalties applying, only receiving a warning, or having to forfeit their next match, do not accurately capture the severity of the situation concerning illegal decks, hence they are not appropriate consequences in this context.