Missing sideboard cards? The full 15-card sideboard runs about $228.
Buy sideboard on ManapoolStiflenought's counterspell suite (Counterspell, Foil, Daze, Thwart, Misdirection) makes Duress a weaker form of disruption since they can simply counter your reanimation spell instead of worrying about hand attacks, so trim one Duress for a redundant Stifle to counter their Dreadnought's sacrifice trigger before they can protect it with their own Stifle or Vision Charm. The extra Shallow Grave gives you another cheap, hard-to-interact-with way to put a creature into play with haste, racing their clock. Keep Worldly Tutor and Reanimate as your primary engine since this matchup is a speed race and you want to be first to a big threat. Prioritize playing around their open blue mana rather than walking into counterspells with your combo pieces.
Stifle is excellent here since it can counter Attunement's return-to-hand ability or Parallax Wave's fade-counter removal ability, disrupting their Replenish combo sequencing at a key moment. Duress is a reasonable include already at 4 copies but trimming to 2 lets you bring in a faster clock piece since their deck is full of enchantments that are hard to predict and strip one at a time with Duress, and they have Sterling Grove-less protection here meaning you'll rarely get a crucial Duress hit. The extra Shallow Grave helps you present a fast, resilient threat before they can assemble Opalescence plus Parallax Wave. Try to race before turn four or five, since once Replenish resolves with their enchantment package you are likely locked out.
Terrageddon wants to Armageddon into a Treetop Village or Terravore while you have nothing, so Sylvan Safekeeper lets you protect your key creature (like a reanimated Dreadnought or Hermit Druid) from their Swords to Plowshares by sacrificing a land, which is a small price when they're about to blow up your lands anyway. Duress comes out since it only hits noncreature nonland cards and much of their relevant threats are creatures (Terravore, Wild Mongrel, Werebear) that Duress can't touch. Your plan is to go over the top fast before Armageddon locks the board, since your low curve and mana acceleration (Lotus Petal) let you rebuild faster than they can. Watch for Wasteland on your nonbasic-heavy manabase.