So, I was an idiot that gave Arena money for a mode that doesn't work. I built a brawl deck (even selected "brawl" from the deck type drop down when I did), bought the gems, bought the Brawler's Guildhall event, then found I couldn't select a brawl deck. Clicking the big or "choose your deck" on the event page brought up my decks, with the only button being "edit deck" after my deck list was up, including my brawl deck with no warnings listed. selecting the deck only gave me the option of "done." I've tried removing and re-adding my commander. I have no banned cards. All cards are standard legal. I re-confirmed that the deck is "brawl" in the drop down. Tried copying and pasting. Tried building a new deck entirely after selecting the "choose your deck" from the brawl event page. What am I missing? I'm about to demand a refund :(