Dimir Midrange relies heavily on enters-the-battlefield triggers from Dream Beavers, Floodpits Drowner, and Spyglass Siren, so Torpor Orb shuts off their value engine and blanks Floodpits Drowner's enters-the-battlefield tap-and-stun effect entirely. Duress strips Requiting Hex, We Say Thee Nay!, or a Strategic Betrayal before it can disrupt your plan, which matters since their deck is full of cheap interaction rather than big threats. Firebending Lesson and Flashback come out because their creatures are mostly small utility bodies that die to your other removal and sweepers, making dedicated single-target burn and recasting spells from your graveyard less necessary. Keep Jeskai Revelation and Deadly Cover-Up in to reset the board against their go-wide token and Ninja plans, and lean on Inevitable Defeat to answer Kaito, Bane of Nightmares before he locks down your attackers.