Boros Energy floods the board with cheap creatures and tokens (Ocelot Pride cats, Voice of Victory Warriors, Ragavan), so Brotherhood's End's 3 damage sweeper mode is excellent at resetting their board while also incidentally hitting their Blood Moon and artifacts they might play. Endurance's evoke lets us flash it in for free against aggressive curves, giving us a 3/4 reach blocker while denying them any graveyard shenanigans, and it's a fine draw against Ragavan's exile trigger too. We trim the slower interaction (Dead // Gone, Sink into Stupor, Wistfulness) since they don't match the speed of this matchup, keeping our proactive plan of Crashing Footfalls and Violent Outburst rhinos to stabilize and close quickly. Force of Negation and Subtlety remain crucial to stop their Ajani, Nacatl Pariah or Ragavan on the play.