M20 cards in Brawl

When I went to go and make a brawl deck, I wasn't able to see any of the M20 cards within the list or select a M20 card as a commander. This might be a simple fix where you just enable that set that can be used in that format.
High Quality Resources for Collectible Card Games and Home of the CCGHQ Team
https://www.slightlymagic.net/forum/
https://www.slightlymagic.net/forum/viewtopic.php?f=26&t=28805