Nihil Spellbomb exiles their graveyard, directly attacking the density that makes Tolarian Terror and Cryptic Serpent cheap, and it cantrips itself away when it dies so it's low-cost. Steel Sabotage and Blue Elemental Blast are dead since their key threats and spells are blue and non-artifact, so they stay in the sideboard. Keep your counterspell suite (Counterspell, Dispel) to protect your own threats and disrupt theirs, and lean on Baleful Strix/Refurbished Familiar for early blocks against Delver of Secrets.