Consign to Memory is premium here. It cheaply counters their colorless artifact spells like Mishra's Bauble, Mox Opal, and Engineered Explosives, and it also counters triggered abilities such as the Pinnacle Emissary and Weapons Manufacturing triggers. Its Replicate mode lets us hit several of those spells or triggers in one turn. It can't counter Kappa Cannoneer or Pinnacle Emissary themselves, since both are colored spells. Toxic Deluge sweeps their artifact creature army (Pinnacle Emissary, its Drone tokens, and Constructs) when they go wide. It doesn't target, so it also gets around Kappa Cannoneer's ward {4}, but it costs life and hits our own creatures too, so size X carefully. Spell Pierce and Consider are cut as they're too passive against a fast, low-to-the-ground aggro-combo deck. Unearth is slightly weaker here because tempo matters more than grindy value. Keep Fatal Push for Pinnacle Emissary (with revolt), Drone tokens, and Emry. Push can't kill Kappa Cannoneer, which has mana value 6 and ward {4}, so keep Counterspell as our main answer and hit it on the stack.