Boros Dwarves is an aggressive Equipment-based creature deck with almost no relevant noncreature spells for Duress to hit, so it comes out. Clarion Conqueror is a 3/3 flying blocker that also turns off their Equipment and Leyline Axe-style equip abilities and Kili the Resourceful's activated ability. Thor, God of Thunder blocks well in the air and punishes their creature-heavy plan by recurring our own removal from the graveyard. Keep Fire Magic and Deadly Cover-Up in as sweepers against their wide board of small Dwarves.