Izzet (red/blue) focuses on Rooms, which will reward your eerie synergies despite being off-color, while Dimir (blue/black) uses the same eerie synergies for a more control-based strategy
Its closer to $500-700 if you dont need it to be tournament-legal , though
Whenever one or more creatures deal combat damage to you, convert Starscream
Persist is a very sweet ability thats often looked down on because design teams avoid mixing mechanics that use +1/+1 and -1/-1 counters to minimize confusion, and mechanics that feature +1/+1 counters tend to be very popular
Admittedly, its worth remembering that Brawl and Commander are literally different formats
As a note at time of writing, the set is still being spoiled so there may be legends I miss, and obligatory spoiler warning