I've been thinking of doing a mini-MTG tournament in Magic Arena since I play it so much. I'm not sure of the structure yet, and we might not be able to stream it, but we did one a few years ago for Rocket Arena and it seemed like that worked out. So if you're interested, please let me know your MTGA name in the comments here and if we get enough people I'll try to make some brackets up.
This will be pretty low stakes and I'm still deciding on a format, but we'd probably either do a regular old standard tournament style (best of three, coin flip, sideboards and all) or make it easier and do a Brawl tournament with some kind of banlist for commanders (and maybe just ban Ugin from decks entirely). If you're interested reply below!