Mono-Blue has essentially no creatures beyond incidental threats, so Wrath of God and Rout are dead cards and come out for proactive disruption. Meddling Mage naming Stasis locks their primary control/lock plan out of the game and demands an answer, while Quash is excellent against their Chain of Vapor or countermagic, exiling further copies to deny redundancy. This is a grindy mirror-like matchup decided by who resolves and protects their engine first, so keep your full counterspell suite (Counterspell, Mana Leak, Absorb) and Fact or Fiction to fight through their Impulse/Gush card selection. Standstill is at its best here since Mono-Blue is under real pressure to break parity carefully.