We will be performing scheduled maintenance on July 25th, 2019 at 8AM PT (15:00 UTC) to deploy the 0.17.00.00 game update. Maintenance is expected to last approximately two hours.
While no downtime is expected, this is a required update. Players who are logged in prior to the start of maintenance will be required to restart their client to download the patch.
Patch notes will be available once maintenance is complete. You can read more about this update, here: https://magic.wizards.com/en/articles/archive/magic-digital/mtg-arena-state-beta-july-2019-07-18