Mono Black Aggro leans on cheap removal like Fatal Push and Bitter Triumph plus discard from Thoughtseize, so protecting our threats matters more than adding more combat tricks, which is why Monstrous Rage largely comes out. Octopus Form gives our attackers hexproof and untaps them, dodging removal and letting us swing back in profitably against their Bloodghast and Gifted Aetherborn. Fiery Impulse and Redcap Melee are efficient answers to their early creatures, with Redcap Melee also able to pick off Baron Helmut Zemo or Ral Zarek, Guest Lecturer before they generate value. Firebending Lesson adds another flexible removal spell that can scale up against bigger threats like Overlord of the Balemurk once it becomes a 5/5 creature. The extra copy of Boomerang Basics in the mainboard is redundant once the deck shifts toward direct removal, so one copy moves to the side.