Good question! It's confusing, because there are a bunch of formats and there's no real guide to what they are.
Open - the game's original rules. The Glossary follows Open format.
OTF - Official Tournament Format. Launched in 2010, this format makes seven large changes to Open format, including making most mission stealing illegal and creating a ban list. VIRTUALLY ALL games played today follow OTF. The only time you'll generally play Open is if you're doing a sealed deck OTSD event.
X-List - Before OTF existed, there was a short-lived format called X-List that tried to fix serious problems in Open format by banning a huuuuuge number of cards. It is no longer supported by the CC, but the rules have stayed on the front page.
Revised - Before OTF existed, there was another short-lived format called Revised that tried to fix the problems in Open format by creating new rules. OTF is a hybrid of X-List and Revised. Revised is no longer supported by the CC, either.
That reminds me...
isn't it time to take X-List and Revised off the main page? That was supposed to happen at the end of last year. Gonna go do that. I'll put up the new and fancy DRG while I'm there, since I forgot to do that on the appropriate Monday of this month. (And then I'll try and get X-List and Revised out of the search engine and stuff next week.)
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