This matchup is a durdly grind where our interaction needs to answer big threats like Emrakul and the Eldrazi Spawn-fueled Urza's Saga/Eldrazi Temple engine rather than cheap spells. Meltdown at X=1-2 cleans up Urza's Saga Constructs, Springleaf Drum, and Vexing Bauble, and X=2 also catches Talisman of Resilience. It only destroys artifacts, so it does nothing to their Eldrazi creatures or lands. Surgical Extraction can strip a second copy of Ancient Stirrings or Malevolent Rumble to disrupt their card selection engine, or exile a key Emrakul after we counter one copy. Spell Snare and Spell Pierce are weaker here because the threats that matter most, Emrakul (mana value 13) and Devourer of Destiny (mana value 7), are creature spells that neither can handle. Spell Snare only catches Kozilek's Command when X=0, and Spell Pierce can target it but their mana development makes the tax easy to pay. They come out in favor of more impactful disruption.