Azorius Standstill has few creatures worth a spot-removal spell, so Chainer's Edict and Smother are largely dead and should come out. Naturalize gives you cheap answers to Powder Keg, Phyrexian Furnace, and Humility, and it can also destroy an animated Mishra's Factory. Be careful about casting it into an active Standstill, since any spell you cast gives them the trigger and three fresh cards. Extra Duress strips Wrath of God or a counterspell before it can reset your board or protect theirs. Respect Standstill by not over-extending into empty board states and let them break it first. Genesis and Wall of Blossoms give you card advantage to grind through their removal and counters. Haunting Echoes has little upside against a deck with minimal graveyard reliance, so it stays out.