This is a mirror-ish grind against another blue-based control deck with no red cards and only two artifact creatures, so Blue Elemental Blast and Steel Sabotage have essentially no targets and stay in the sideboard. The extra Negate helps stop their noncreature card advantage (Lorien Revealed, Plunder the Trollshaws) and removal (Snuff Out, Cast Down, Agony Warp) at crucial points. A second Murmuring Mystic adds redundant inevitability, flooding the board with flying tokens off your instant/sorcery loops, which outgrinds their monarch plan over time. Trim the weakest card-selection creature, Sea Gate Oracle, since the matchup rewards raw card advantage and countermagic over incremental filtering.