Mono Red Rally has no blue cards, so Pyroblast and Red Elemental Blast have no legal targets here and must stay in the sideboard despite being strong blue hate cards elsewhere; this is a common sideboarding trap we're avoiding. Since their explosive turns rely on going wide with artifacts like Clockwork Percussionist, Gingerbrute, Inventor's Axe, and Blood tokens from Voldaren Epicure (which also turn on Goblin Tomb Raider), Vandalblast is excellent, overloading for {4}{R} to destroy every artifact they control. Keep Prismatic Strands in: most of their damage comes from red sources like their burn spells, Goblin Bushwhacker, and their red creatures, so naming red on a big Goblin Bushwhacker turn can blank much of it. Be aware that the white Human Soldier tokens from Rally at the Hornburg and the colorless Gingerbrute are not red sources, so naming red will not stop their damage. The one cut is the Soul-Guide Lantern, since graveyard hate does nothing against their proactive board-flooding plan. Our removal (Dispatch, Lightning Bolt, Galvanic Blast) and blockers remain critical to survive their alpha strikes before Rally at the Hornburg comes down.