Historical Rules · 23 August 2019
Rule 100.6
Official source text from the 23 August 2019 Rules release
Most Magic tournaments (organized play activities where players compete against other players to win prizes) have additional rules covered in the Magic: The Gathering Tournament Rules (found at WPN.Wizards.com/en/resources/rules-documents). These rules may limit the use of some cards, including barring all cards from some older sets.