Mono-Blue Artifacts vs Eldrazi

Eldrazi mainboards its own Chalice of the Void and plays large colorless bodies like Reality Smasher and Thought-Knot Seer that your deck has few ways to remove, so Dismember's -5/-5 is one of your only efficient answers to their threats. Pithing Needle can shut down Kozilek's Command's activated-adjacent abilities or a problematic land like Eye of Ugin, though note it won't stop static effects like It That Heralds the End's cost reduction. Cut the slower card-selection artifacts since this is a race decided by who resolves their own Chalice first and who can remove the other's threats, and your own Chalice of the Void at one is especially strong against their Lotus Petal and one-mana plays.