Mono-Blue Faeries relies on tempo plays like Brinebarrow Intruder and bounce/counter effects to protect its board while chipping in with Ninja of the Deep Hours and Spellstutter Sprite, so Standard Bearer forces removal-style effects and targeted spells they control onto itself, protecting your real threats. Their interaction is mostly countermagic (Counterspell) and small creatures rather than removal, but Standard Bearer still absorbs their occasional Snap bounce spell meant to clear a blocker, even if it does not absorb triggered abilities like Brinebarrow Intruder's -2/-0 effect. Guardians' Pledge is cut since this matchup rewards resolving and protecting a wide board more than a single combat trick, especially against a deck full of 1-toughness Faeries that your Thraben Charm and combat already handle well. Keep pressuring through their tempo plays with your low curve.