Tournament errors are violations of the Magic Tournament Rules. If the judge believes that the error was intentional, they should consider Unsporting Conduct — Cheating.

If a player violates the Magic Tournament Rules in a way that is not covered by one of the infractions listed below, the judge should explain the appropriate procedure to the player, but not issue a penalty. Continued or willful disregard of these rules may require further investigation.

A Warning for a Tournament Error offense is upgraded to a Game Loss if the player has already received a Warning for an offense in the same category. For multi-day tournaments, the penalty count for these infractions resets between days.