Caw Gates leans on Melded Moxite for card filtering and Gate synergies like Basilisk Gate's late-game pump, making Duress a strong proactive answer to strip their key noncreature spells before they generate value. Sacred Cat and Outlaw Medic are small lifelink threats your existing removal suite (Cast Down, Thraben Charm) already answers well, so the swap is mostly about disrupting their noncreature spells rather than restructuring the board. Eviscerator's Insight is cut since this matchup is more of a grind where you don't want to feed your own permanents to the graveyard, and Suffocating Fumes' -1/-1 undersells against their sturdier 1/3s and 2/3s.