Boros Moxite plays a wide board of small creatures, artifacts, and equipment like Melded Moxite, Kor Skyfisher, Glint Hawk, and Ragged Short Spear-wielding threats, so Breath Weapon's 2 damage to each non-Dragon creature cleans up their 1-2 toughness bodies at once. Nihil Spellbomb exiles their graveyard against Pursue the Past-style recursion and cantrips when it dies, while being a cheap artifact. Sneaky Snacker doesn't keep pace with their go-wide aggression, so it comes out fully. Keep your removal suite lean on their creatures and race their life total with your burn spells when the board resets.