Devoted Combo wants to chain Devoted Druid/Green Sun's Zenith/Nature's Rhythm to assemble a huge mana engine and finish with Craterhoof Behemoth; Containment Priest is a hard lock against anything fetched by Green Sun's Zenith or Nature's Rhythm since those creatures aren't cast. Ashiok, Dream Render turns off their fetchland searches for Verdant Catacombs/Windswept Heath and mills them while denying graveyard value from Agatha's Soul Cauldron. Prismatic Ending can exile problematic mana dorks like Delighted Halfling or Devoted Druid cheaply. Spell Snare and March are cut since they're too narrow against a combo deck that plays around single-target interaction; prioritize proactive hate pieces and Wrath of the Skies to catch their board post-combo.