Boros Dwarves relies heavily on Equipment like Leyline Axe, Lavaspur Boots, and Dragonfire Blade to pump small bodies like Dwarven Mauler and Kili the Resourceful into real threats, so artifact removal is premium. Guerrilla Gorilla can sacrifice itself to destroy a key noncreature artifact like Leyline Axe or Doc Ock's Tentacles, and its reach lets it block their ground creatures reasonably. Glorious Decay's artifact destruction mode is a clean answer to their Equipment suite as well. Deadly Precision's additional cost is a real tax against an aggressive deck, and Umbral Collar Zealot's lack of impact on the board doesn't keep pace with their equipped creatures, so trim both for proactive artifact hate.