Duress is a fine fit here because their deck is full of noncreature engine pieces like Lunar Convocation, Ajani Resolute, and Case of the Uneaten Feast, and taking one early keeps the lifegain plan from getting going. Strategic Betrayal is decent here because it makes them exile a creature of their choice (so expect them to give up their worst one, not Amalia Benavides Aguirre or Moseo, Vein's New Dean) while also exiling their graveyard, which cuts off Moseo's Infusion recursion. Shoot the Sheriff gives unconditional removal for non-outlaw threats like Haliya, Guided by Light, which Requiting Hex can't touch at mana value 3. Erode comes out because handing them a free basic land search just ramps them, and Iron-Shield Elf is a weak attacker against a deck full of 1/2s and 2/1s that just gains the life back. Keep the core discard-synergy package (Marauding Mako, Cool but Rude, Inti) intact since racing and disrupting their hand matters more than grinding card-for-card against their incremental life gain.