Eldrazi's entire mainboard is colorless, making Consign to Memory a premium answer that counters Reality Smasher, Thought-Knot Seer, Eldrazi Linebreaker, Sire of Seven Deaths, and even Chalice of the Void as they're cast. Lavinia, Azorius Renegade taxes their Kozilek's Command and Eldrazi Confluence, making it harder to deploy disruption alongside their proactive threats. Spell Pierce is weak since Ancient Tomb and Eldrazi Temple give them plenty of mana to pay around it, and Back to Basics does little since their lands already tap mostly for colorless mana regardless of untapping. Teferi and Dress Down are cut since they don't meaningfully interact with a deck of efficient colorless beaters.