Hydroblast is dead here since Azorius Standstill is white-blue with no red spells or permanents. Annul can proactively counter their Standstill or other enchantment/artifact threats before they resolve, disrupting their plan. Tsabo's Web slows down their utility lands like Mishra's Factory, Faerie Conclave, and Kor Haven by preventing them from untapping during their untap step, which is a real tempo gain against a deck relying on manlands and Kor Haven for defense. Keep your countermagic dense to fight through their own Counterspell/Mana Leak suite and land Phyrexian Dreadnought under Standstill before they can profitably break it.