Mono-Blue Faeries is a tempo-tribal deck full of 1/1 fliers like Faerie Seer, Faerie Miscreant, and Spellstutter Sprite backed by Counterspell, so cheap efficient plays that dodge countermagic are prized over big spells. Thraben Charm dealing damage equal to twice your creature count is excellent removal for their fragile 1-toughness Faeries, easily killing a key piece once you have a couple creatures in play. The slow Nyxborn Hydra bestow plan is a poor fit against a deck full of cheap interaction that can counter or bounce it profitably. Keep the low curve of your removal suite like Lightning Bolt and Journey to Nowhere, since they answer Faerie threats efficiently before Ninja of the Deep Hours or Spellstutter Sprite value snowballs.