Historical Rules · 4 February 2011
Rule 100.6
Official source text from the 4 February 2011 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 http://www.wizards.com/Magic/TCG/Events.aspx?x=dci/doccenter/home). These rules may limit the use of some cards, including barring all cards from some older sets.