Blood Moon is excellent against their Eldrazi Temple/Ugin's Labyrinth-reliant manabase, often locking out their colorless payoffs entirely. Consign to Memory answers colorless spells like Kozilek's Command, plus Emrakul's triggered mind-control ability. Spell Snare has few legal targets since their curve is spread across 1, 3, and 4+ mana costs; Force of Negation struggles as most of their real threats are creature spells it cannot counter.