D.6.1- All DCI tournaments are played as per the most recent text on cards. This means you play all cards as if they read like the most recent English language version of the card (plus errata). [Tournament Rules 1996/10/01] When Oracle (a complete card reference) is available, it should be used. [Tournament Rules 1997/10/01]
D.6.2- You may play cards from older or newer printings and expansions which bear the same name as a card which is allowed in the tournament format. Regardless of printing, however, Rule D.6.1 applies. [Aahz 1997/07/13]
D.6.3- Non-English language cards are played as the most recent English language version of that card. Translational errors are avoided in this way. [Tournament Rules 1996/10/01] For misprinted cards with the wrong art, the card name is what is used to make a match. If the head judge determines that the misleading art is being used to create an advantage, they can consider this as cheating. [Tournament Rules 1997/10/01]
D.6.Ruling.1- Rule D.6.1 applies even if the cards from the most recent edition are not actually legal in the tournament format. For example, the Fifth Edition text of Cloak of Confusion would be used when playing in an Ice Age/Homelands/Alliances tournament. [Aahz 1997/07/13]
D.6.Ruling.2- Mixed language decks are legal. [Aahz 1995/07/09]