This matchup has no red spells for Hydroblast to hit, so it stays in the sideboard — the opponent is mono-blue with no red permanents or spells listed. Reconsidering: bring in Dispel to protect our key spells and fight through their Counterspell/Dispel suite, and lean on our own counterspells and removal to answer Tolarian Terror and Cryptic Serpent before they get cheap. Thorn of the Black Rose and Campfire are too slow and don't affect the graveyard-fueled threats or protect us from countermagic, so they're the easiest cuts for more interaction.