Pyroblast counters or destroys nearly everything this deck does — Delver of Secrets, Tolarian Terror, Cryptic Serpent, Counterspell, Brainstorm, Dispel, and Lorien Revealed are all blue. Envelop gives a second free counter for their sorceries like Ponder. Hydroblast and Blue Elemental Blast stay in the board since this opponent plays essentially no red spells. Moment's Peace and Lose Focus are weaker here since this matchup is about disrupting their graveyard-fueled threats and permission, not racing combat damage.