Eldrazi Tron's mana base of Urza's Mine/Power Plant/Tower and Eldrazi Temple can generate huge colorless mana surpluses, so Damping Sphere is devastating — it caps every land tapped for 2+ mana down to a single {C} and taxes their multi-spell turns, badly hurting a deck that wants to chain Expedition Map into Karn, the Great Creator into a big Eldrazi in one turn. Consign to Memory counters Kozilek's Command and can target Devourer of Destiny or its cast trigger, giving you flexible answers against their core payoffs. Spell Snare cleanly answers Mind Stone at two mana before they ramp off it. Trim fetches and a slow surveil-land, since this matchup is about disruption density, not tempo.