Boros Moxite plays no blue cards, so Pyroblast and Red Elemental Blast have no legal targets and stay in the sideboard; this is a Boros aggro deck built around equipment (Ragged Short Spear), auras-free aggression, and artifacts like Melded Moxite, Lembas, and the Bridge lands, so Vandalblast is strong against their nonland artifacts, though the Bridge lands (Rustvale Bridge) are indestructible and survive. Dispel and Campfire are trimmed since they have minimal counterspells to stop and we need to be proactive against their efficient curve of Kor Skyfisher, Glint Hawk, and Sneaky Snacker; Breath Weapon's 2 damage kills Sneaky Snacker (2/1) but not Kor Skyfisher (2/3) or Glint Hawk (2/2 survives at exactly 2 toughness, actually Glint Hawk is a 2/2 and does die to 2 damage), so we trim one copy rather than overcommitting to the sweeper plan. Keep Counterspell and Galvanic Discharge as our best tools against their efficient white-red threats and equipment.