Boros Aggro is an artifact-based aggro deck that uses Legion Extruder, Spring-Loaded Sawblades, and Weapons Manufacturing to flood the board with artifact tokens and pump them with Melded Moxite and United Battlefront. Deathmark answers their white creature enablers like any creature with a white color identity at one mana, providing tempo-positive answers. Intimidation Tactics disrupts their combat math, forcing unfavorable blocks or preventing a lethal swing when the board is stalled. Nowhere to Run can permanently exile a key threat like a large United Battlefront creature or Legion Extruder, removing their ability to rebuild that axis. Day of Black Sun is your primary sweeper — prioritize keeping mana open for it when they have a wide board, as a single sweeper can negate several turns of their development.