Pyroblast is excellent here since the opponent's entire maindeck is blue, letting it counter Counterspell or Tolarian Terror, or destroy a resolved Delver of Secrets or Cryptic Serpent. Standard Bearer forces the opponent's targeted permanent-based effects, like Deem Inferior and Sleep of the Dead, to target it instead of our Auras or other creatures, protecting key enchanted creatures from their limited interaction. It does nothing against Counterspell, which targets spells on the stack rather than permanents. Cartouche of Solidarity and Sentinel's Eyes are the weakest enchantments since their token and keyword upside matter less against a deck with no combat-based removal, so they make room without touching the core hexproof-and-Aura engine. Keep Armadillo Cloak, Rancor, and Ancestral Mask in at full count, as the plan is still to resolve a hexproof threat and bury the opponent in Auras before their mill engine or Counterspell suite can catch up.