Mono-Blue Faeries is entirely blue, making Pyroblast a premium tool to counter Counterspell or destroy Spellstutter Sprite, Faerie Seer, and Moon-Circuit Hacker before they generate value or protect their board. Envelop counters any sorcery they cast, such as Of One Mind, denying their card-draw engine. We trim Galvanic Blast since most of their creatures are 1-toughness and easily killed for value already exists elsewhere, freeing slots for proactive blue hate; Toxin Analysis is cut as too slow against their tempo plan. Prioritize using color hate on their card-advantage engines (Faerie Miscreant, Moon-Circuit Hacker) over their small beaters.