This mirror comes down to who lands the bigger threat and protects it; Unable to Scream turns off Tolarian Terror or Cryptic Serpent as a threat by stripping their abilities and shrinking them to a 0/2, which is a great rate against their bombs. We trim Snap and a Harrier Strix since they're only doing similar things less efficiently, and keep our counterspell suite intact since this is fundamentally a counter war. Watch out for their own Dispel and Counterspell when trying to jam our threats.