Banned and restricted cards
Banned cards are cards that are not allowed in a particular tournament. Banned lists exist for individual formats. Wizards of the Coast and the DCI control the bannings for their officially sanctioned formats Legacy, Vintage, Standard, Extended, Modern, as well as all formats played on Magic Online. These bannings (or lack thereof) as well as cards being unbanned are announced on the 20th every three months, and take effect on the 1st of the following month.