Jund is a creature-heavy midrange deck with cheap threats like Greedy Freebooter, Callous Inspector, and The Sackville-Bagginses. Requiting Hex stays in because nearly all of those creatures have mana value 2 or less, and only Smaug the Magnificent and Rottenmouth Viper are out of its range. Duress takes their noncreature spells, including Deadly Precision, their one main-deck removal spell, along with Lively Dirge and Obsessive Pursuit, before they can interact with our bombs. Strategic Betrayal makes them exile a creature of their choice plus their whole graveyard, which is excellent against a deck built around Lively Dirge recursion. Bitter Triumph costs life we want to keep against an aggressive board, and Analyze the Pollen, Seasoned Cryomancer, and a copy of the expensive Ardyn, the Usurper are too slow or low-impact against their cheap curve. Keep Harvester of Misery in, since its -2/-2 sweep punishes their small creatures, and keep Overlord of the Balemurk in as a resilient threat that rebuys our reanimation targets.