BW Control leans on Duress, Vindicate, and Gerrard's Verdict to strip your hand while backing up Exalted Angel and Eternal Dragon with Wrath of God and Bane of the Living, so a full set of Duress lets you proactively remove their disruption or a timely Vindicate before it hits a combo piece. Wall of Roots dies to Vindicate or simply gets outclassed by Exalted Angel and Eternal Dragon as a blocker, making it the clean cut to fund this swap. This matchup rewards speed since their sweepers can reset the board, so look to assemble Hermit Druid before they stabilize with card advantage from Skeletal Scrying or Eternal Dragon recursion. Their low Wasteland count means your manabase should hold up fine through the midgame.