What document outlines the key rules and procedures for MTG tournaments?

The Magic Tournament Rules (MTR) is the primary document that outlines the key rules and procedures for Magic: The Gathering tournaments. It provides essential information about tournament structure, player conduct, event operation, and the roles of judges and players. By clearly delineating guidelines for various tournament formats and situations, the MTR helps ensure that events run smoothly and fairly, giving players a consistent framework to follow.

In contrast, the other options do not serve the same purpose. The Rules of Engagement typically pertains to guidelines for competitive situations but does not specifically address Magic tournaments. The Magic Rules Handbook focuses on the gameplay rules and mechanics of Magic: The Gathering but does not detail tournament operations or procedures. The MTG Official Guide may provide general information about the game, but it is not the specific document that provides comprehensive tournament regulations like the MTR does.