Missing sideboard cards? The full 15-card sideboard runs about $80.79.
Buy sideboard on ManapoolRequiting Hex only hits mana value 2 or less and whiffs on Sunderflock, Colorstorm Stallion, and most of their real threats, so it comes out for proactive disruption. Duress strips Traumatic Critique or Prismari Charm before they can protect Hearth Elemental or answer your board, while Get Lost destroys a resolved Hearth Elemental or Sunderflock outright. Cruelclaw's Heist strips a second threat or answer straight from their hand before it can be cast. Dawn's Truce protects your team from Traumatic Critique and Prismari Charm's bounce mode, letting your lifegain engine survive their removal-light, tempo-based plan. Emptiness and Starscape Cleric are too slow and narrow against a deck racing on card selection rather than combat.
Mono-Green Landfall floods the board with mana dorks and landfall payoffs that quickly exceed mana value 2, making Requiting Hex weak beyond the first turn or two. Get Lost and Pyrrhic Strike give you clean answers to bigger threats like Bristly Bill or Mightform Harmonizer that Requiting Hex can't touch. Cruelclaw's Heist strips their best card from hand before it resolves, disrupting their sequencing. Keep the lifegain shell intact since it races well against their go-wide plan.
Duress proactively strips Kaito, Bane of Nightmares, We Say Thee Nay!, or Bitter Triumph before they can control the board, which is crucial against a midrange deck full of removal and disruption. Elenda, Saint of Dusk is a resilient lifegain-synergy threat with hexproof from instants that dodges much of their instant-speed removal suite and grows quickly given how much life this deck gains. Emptiness is clunky here since their creatures like Kaito or Cecil don't always die cleanly to -1/-1 counters, and Voice of Victory's mobilize tokens die easily to their removal-dense plan, so both are trimmed for more resilient threats and disruption.