The rotating constructed format that only allows cards from a defined recent window of sets (roughly the last two to three years), refreshed as new sets enter and older ones rotate out. The primary format Wizards designs new Standard-legal sets to support. A main deck needs a minimum of 60 cards and may use a sideboard of up to 15 cards. Once per year, after the first premier set Prerelease of the year, the six oldest sets in Standard rotate out.
For new players
Standard matches can be best of one or best of three games, and Wizards says a game lasts about 20 minutes on average.
A Standard player brings a 60-card main deck and a 15-card sideboard to a best-of-three match.