Boros Aggro brings a fast, wide board of Dragons and tokens, so Avatar's Wrath is a devastating answer, airbending their entire board away while locking them out of casting anything outside their hand, buying a full turn cycle to stabilize. The extra Get Lost gives us more clean removal for their key threats like Sarkhan or Clarion Conqueror. Mockingbird is weak here since copying their aggressive creatures doesn't address the speed of their clock, and Curious Farm Animals' small body doesn't block their bigger Dragons effectively. Keep our full removal suite (Erode, Get Lost) and lifelink/flying bodies to stabilize against their burn and attackers.