Azorius Replenish leans on blue spells like Attunement and Frantic Search to dig for and discard its enchantments before Replenish brings them all back, so Pyroblast can counter either of those or any other blue spell they commit to their draw-and-dig plan. Tranquil Domain is a huge blowout after a resolved Replenish, destroying all their non-Aura enchantments — Opalescence, Parallax Wave, Decree of Silence — in one shot since you run none yourself. Tormod's Crypt strips their graveyard proactively before they can Replenish it back, denying the whole payoff. Tsabo's Web and Crystal Vein come out since their manabase is mostly fetches and dual lands with few vulnerable utility lands, and you'd rather hold up proactive answers to their combo.