Boros Aggro is a fast, flying-heavy deck (Momo, Magmatic Hellkite, Nova Hellkite, Twinmaw Stormbrood) that races hard, so extra copies of Meltstrider's Resolve give our creatures reach to fight down their threats while gaining toughness to survive combat, and Warg Tactics can specifically destroy an attacking flier like Magmatic Hellkite or Nova Hellkite. Keen-Eyed Curator is a 3/3 for GG that doesn't block well against a deck this aggressive and its payoff is irrelevant here. We trim one Shared Roots since we need interaction more than incremental ramp against this clock. Prioritize stabilizing the board with removal and bigger bodies before they close the game out with haste threats.