Mono-Green Eldrazi is loaded with colorless/devoid spells (Kozilek's Command, Sowing Mycospawn, Emrakul, big Eldrazi finishers), making Consign to Memory extremely efficient at one mana with replicate scaling. A second Wrath of the Skies is valuable against their many mana dorks and Eldrazi Spawn tokens. Counterspell is cut down since it's often too slow/costly compared to Consign against a ramp deck, and Day's Undoing is bad since it just refills a deck that wants more cards and more time. Keep Solitude and Wraths in to answer their giant Eldrazi threats.