In an announcement earlier today, Wizards announced that Oko, Thief of Crowns, has been banned from the Brawl format in MTG Arena.

  • The ban is only for the Brawl format.
  • If you have this card in your collection, you will not receive wildcards as compensation for the ban.
  • Restart your client before the Wednesday Brawl starts to prevent an "invalid deck" error message for decks containing Oko.

Quote From MTG Arena Admin

MTG Arena Effective Date: November 5, 2019

Brawl:

  • Oko, Thief of Crowns is banned.

This includes using Oko, Thief of Crowns as your commander or as part of your deck. As a general reminder, Direct Challenge outside of Tournament Mode does not enforce card bans.

REGARDING PLAYER COLLECTIONS:

Players who have Oko, Thief of Crowns as part of their in-game collection on MTG Arena prior to this announcement will not be receiving Wildcards as part of this update. Oko, Thief of Crowns is still playable in all other formats and events.

A NOTE ON WEDNESDAY BRAWL:

Players will need to restart their client at any point before the start of Wednesday Brawl on November 6, 2019 at 8 a.m. PT for Brawl decks containing Oko, Thief of Crowns to appear unplayable. Otherwise, players will not see that their deck is invalid until they hit “Play” (which will cause an “Invalid Deck” error message to appear).