Historical Rules · 1 November 2013
Rule 112.6m
Official source text from the 1 November 2013 Rules release
An ability that modifies the rules for deck construction functions before the game begins. Such an ability modifies not just the Comprehensive Rules, but also the _Magic: The Gathering_ Tournament Rules and any other documents that set the deck construction rules for a specific Constructed format. However, such an ability can't affect the format legality of a card, including whether it's banned or restricted. The current _Magic: The Gathering_ Tournament Rules can be found at <Wizards.com/WPN/Events/Rules.aspx>.