Scheduled maintenance is now complete. Patch notes are available, here: https://forums.mtgarena.com/forums/threads/61659

Scheduled maintenance is currently in progress. We will provide updates as necessary.

We are currently undergoing scheduled maintenance to implement the November 18, 2019 Banned and Restricted Announcement. For more information, click here: https://magic.wizards.com/en/articles/archive/november-18-2019-mtga-arena-banned-announcement

This is a data only deployment, and no downtime is expected.