Commander Anthology for Brawl
I really enjoy playing Historic Brawl on Arena. I think WOTC did a really good job adding that format to the game. However, the card pool seems to be lacking in a few areas. I think a few more cards should be added to the platform as a "Commander Anthology" to make it feel more like playing Commander.
Sol Ring - It is a staple in Commander Decks and should be added to Historic Brawl with the caveat that it be only playable in Historic Brawl to avoid issues with Historic in general.
Two Mana Ramp Spells. - I think a card like Rampant Growth should be added as there are very few two mana ramp spells in green that put extra lands onto the battlefield. Into the North only works for snow lands, Emergent Sequence makes the land a creature which can be easily killed, and Thunderherd Migration only works with Dinosaurs. We need more options for green based decks.
Diabolic Tutor - Was available as part of Kaladesh before it was removed during the beta testing period and wasn't restored with Kaladesh Remastered. Only black tutor spells available are Grim Tutor, and Mastermind's Acquisition which produces warning that no sideboard is available. Demonic Tutor is currently banned.
Add the Talismans for every color pair. Most of the two mana rocks available only produce colorless mana. The talismans can fix this issue especially for multi color decks.