UR Aggro is full of red spells like Burst Lightning, Ancestral Anger, and Wild Ride, making Flashfreeze a strong catch-all counter against their removal and pump spells. Torpor Orb is unclear value here since their key payoffs (Slickshot Show-Off, Pompous Battlemage) trigger off casting spells rather than entering the battlefield, so it has minimal impact — consider this a lower-priority inclusion. Trim the slow Jace's Machinations and single Erode since you need efficient interaction against their low curve rather than clunky answers. Keep Day of Judgment and Get Lost as your removal backbone against their aggressive creature base.