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Historical Rules · 1 June 2014

Rule 206.4

Official source text from the 1 June 2014 Rules release

Players may include cards from any printing in their constructed decks if those cards appear in sets allowed in that format (or those cards are specifically allowed by the Magic Tournament Rules). See the Magic Tournament Rules for the current definitions of the constructed formats (Wizards.com/WPN/Events/Rules.aspx).

Find this number in the current Rules