Mono-White Initiative is a hatebears deck that taxes your spells with Thalia, Guardian of Thraben and can outright stop cantrips via Archon of Emeria's one-spell-per-turn restriction, so speed and cheap interaction matter enormously; Ratchet Bomb and Meltdown answer Chalice of the Void or Chrome Mox before it locks you out, though Ratchet Bomb only destroys permanents of a single chosen mana value at a time rather than clearing a board of creatures across different costs. Pyroblast has no blue targets against this mono-white deck, so leave it in the sideboard entirely; prioritize Meltdown, Ratchet Bomb, Unholy Heat, Strix Serenade, and Force of Negation instead. Flow State is far too slow against a proactive Wasteland/Chalice lock deck, and Spell Pierce/Into the Flood Maw don't address their key permanents efficiently. Keep Lightning Bolt, Wasteland, and Force of Will as your primary way to remove their hatebears and protect your mana development.