Harbinger of the Seas turns their Urza's Tower, Urza's Mine, Urza's Power Plant, and Eldrazi Temple into Islands, crippling the mana engine that powers their huge colorless spells. Break the Ice can destroy a key Tron or Eldrazi Temple piece to disrupt their mana, and its overload mode punishes their land-heavy manabase late. Engineered Explosives can be set to clear Expedition Map or Talisman of Resilience. Spell Snare whiffs on their top-heavy curve of giant artifacts and planeswalkers, and the Edict is weak since Devourer of Destiny and Ulamog are typically their only creatures and easily protected, so those come out.