Mono-white Aggro is a go-wide creature deck without colored removal that threatens us in the main (no Lightning Bolt-style burn, no counterspells), and its only artifacts are the Clue tokens from its Inspectors, so Ancient Grudge would only ever hit a Clue and is a poor use of a slot. Our sideboard options are largely poor fits: Red Elemental Blast has no legal targets since they play no blue spells or permanents. Tamiyo's Safekeeping can always target one of our own permanents, but with no removal in their main deck there is little for it to protect against. Spellstutter Sprite's counter mode is weak against their proactive, cheap creature curve that doesn't rely on key spells to counter. The mainboard's Thraben Charm already answers their small creatures (Thraben Inspector, Novice Inspector, Fortress Kin-Guard) and its enchantment-destruction mode can hit nothing here, but its damage mode scales well with our board. Prismatic Strands is a strong defensive tool against their Battle Screech tokens and Ramosian Rally alpha strikes by naming white. No sideboard changes are worth making since nothing in the sideboard clearly upgrades over the existing 75, and our proactive game plan with Sacred Cat, Outlaw Medic, and removal already lines up well.