Mono-Green Eldrazi ramps hard through Eldrazi Temple and Ugin's Labyrinth into Emrakul, Ulamog, and Ugin, so Damping Sphere caps their explosive colorless mana output and slows the ramp plan significantly. Harvester of Misery's -2/-2 ETB sweeps Eldrazi Spawn tokens that fuel their mana base. Vexing Bauble mainly answers free spells, which this deck rarely casts, but it does counter any spell cast for no mana; include it as a low-opportunity-cost artifact that also cycles late. Spell Pierce, Otherworldly Gaze, and one Prismari Charm are too passive against a deck racing to resolve game-ending threats, so they come out in favor of proactive mana disruption and removal. Keep Thoughtseize to strip their ramp payoffs before they land.

Mono-Green Eldrazi leans on Eldrazi Temple and Ugin's Labyrinth to cheat out huge colorless threats like Emrakul, the Promised End and Ulamog, the Ceaseless Hunger; Damping Sphere caps the bonus colorless mana those lands produce, meaningfully slowing their ramp into giant Eldrazi, while Consign to Memory counters their colorless spells and devastating cast triggers. Spell Pierce is weak since many of their key threats are creature spells it cannot target, expensive noncreature spells they can easily pay through, or activated abilities and lands it can't touch. Otherworldly Gaze doesn't pressure their game plan enough. Keep Thoughtseize and Fatal Push in to strip or answer their ramp pieces and midsized threats before they can assemble Ugin, Eye of the Storms or a giant Eldrazi.

Gruul Basking Broodscale Combo runs Urza's Saga to make Construct tokens and relies on lands like Eldrazi Temple and Ugin's Labyrinth for ramp, so Meltdown can wipe out their Urza's Saga-generated Constructs and other cheap artifacts like Vexing Bauble and Soul-Guide Lantern for a scalable blowout. Damping Sphere caps the extra colorless mana their Eldrazi Temple and Ugin's Labyrinth produce and taxes them when chaining cheap spells like Ancient Stirrings and Malevolent Rumble in a turn, slowing their assembly of Devourer of Destiny or Emrakul. Spell Pierce and Otherworldly Gaze are too passive against their proactive ramp-into-big-threats plan. Keep Fatal Push and our discard spells to strip key pieces or kill small creatures like Glaring Fleshraker before they scale up.