Mono-Blue is another Stasis-and-counterspell control deck with Black Vise as reach, so Meddling Mage naming Stasis, Counterspell, or Black Vise is the single best proactive play available since it resolves under their counter magic pressure and denies their key lock piece. This deck has no red spells or permanents, so Hydroblast stays in the sideboard. Cut Frantic Search since discarding cards into a potential Stasis lock is risky when you may not get mana back on time, and the core engine of Replenish, Opalescence, and Parallax Wave is your actual win condition against their lock — just protect it with Decree of Silence and Seal of Cleansing (already maindeck) on Black Vise if it resolves.