Rule Zero Tool Arena
It would be great to have a feature in Arena for pairing desirable Brawl experiences. As an option during deck building, provide an option, like a sideboard, where you can put cards in that you do not wish to be paired against. Brawl is not ranked and therefore is for fun only. So, we should be able to rule zero in some way. For example, I do not typically enjoy brawl games where my hand is attacked, and would exclude pairings against cards that run Thoughtseize effects. Being able to have some agency in the type of game I want to play would definitely make for a better experience on the client.

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Longhair#84059 commented
I think this should be for all formats. If I could get away from Omniscience, Orcish Bowmaster, Thassa, Goblin Charbelcher, red/white energy, heist, blue denial and turn 1 discard spells, I would enjoy the game so much more. Wouldn't be upset if the One Ring went away as well.