Eldrazi Ramp accelerates into Emrakul, the Promised End and Ugin, Eye of the Storms through Utopia Sprawl, Talisman of Impulse, and Ugin's Labyrinth; sweepers are irrelevant because they're not a creature deck, and you need to be countering their acceleration and finishers instead. Consign to Memory is your best card — it hits Utopia Sprawl (denying their primary ramp), Ugin's Labyrinth, Sowing Mycospawn, and Walking Ballista, often with a cantrip attached. Vexing Bauble taxes their ramp package and disrupts Trinisphere and Chalice of the Void out of the sideboard, giving you a cheap artifact to pressure their mana denial plan. Counterspell and Orim's Chant are your primary tools for preventing Emrakul and Ugin from resolving — Chant on their upkeep buys a full turn of development. Teferi, Time Raveler is excellent here for bouncing their ramp permanents and planeswalkers while keeping your own counterspells live.