Collector Ouphe shuts off the activated abilities of Mono-Green Eldrazi's artifacts: Springleaf Drum and Talisman of Resilience mana, Blade of the Bloodchief equip, Haywire Mite's sacrifice ability, and Vexing Bauble and Soul-Guide Lantern. It does nothing to their lands (Urza's Saga, Eldrazi Temple, Ugin's Labyrinth) or to Eldrazi Spawn tokens, so treat it as a modest disruption piece against their artifact ramp and utility rather than a lock. Force of Vigor can destroy up to two of their artifacts and/or enchantments at once (Urza's Saga, Vexing Bauble, Blade of the Bloodchief), and on their turn it can be cast for free by exiling a green card from hand, which is useful against their colorless shell. Cut Summoner's Pact since owing {2}{G}{G} on the next upkeep is a real risk against a deck that can also apply pressure, and trim one Aftermath Analyst as the lowest-impact mainboard card; no lands are touched since the matchup is still a mana-ramp race where Amulet of Vigor and bounce lands remain the core engine.