Eldrazi Ramp is a mana-acceleration deck that deploys enormous threats via Utopia Sprawl, Icetill Explorer, and Eldrazi Temple; Harbinger of the Seas is your most impactful hate card since it turns off all their non-basic lands including Eldrazi Temple and Ugin's Labyrinth, collapsing their mana production to basic Forests only. Engineered Explosives at zero or one destroys Utopia Sprawl and Springleaf Drum-style enablers before they generate mana advantages. Consign to Memory exiles Emrakul, the Promised End or Ugin, Eye of the Storms after they've been cast, permanently removing their threats. Thoughtseize and your counterspell package are critical for stopping their ramp pieces in the early turns. Spell Snare, Force of Despair, and Drown in the Loch are all mismatched against a deck whose spells cost three-plus mana and puts few creatures into play at once.