I'm sorry I didn't post a deadline earlier, I seem to remember Bravelion not setting one for the final round in the past so I assumed that was the best way to do it. Those deadlines work for me.
But at any rate, I'm glad you had fun this round at the MCC. I wish you good luck the next month you participate in And when you say "same criteria", do you mean the MCC rubric?
Also apparently I forgot to hit "save" last night when I was posting the brackets. They should be up now. Apologies for the delay!
Your card has to have your chosen mechanic.
EDIT — You can now choose any mechanic for the main challenge. Hopefully this should fix all the problems.