Pyroblast and Red Elemental Blast are premium here since they can counter the blue Stifle/Vision Charm/Counterspell/Foil/Daze that enable or protect the Phyrexian Dreadnought, or simply destroy a resolved Dreadnought outright. Sulfuric Vortex is too slow when they can just kill you with one Dreadnought swing before the Vortex matters, and the lifegain shutoff is irrelevant against a deck with none. Urza's Bauble comes out since the extra card knowledge isn't worth a card in a race this fast. Keep all your burn aimed at the Dreadnought or the opponent's face, racing them before the 12/12 connects twice.

Red Elemental Blast can counter their blue spells like Mana Leak, Frantic Search, or Intuition, or destroy a resolved blue permanent, giving you interaction against their combo-control engine built around Attunement, Replenish, and Opalescence. Sulfuric Vortex is cut since it's too slow to matter before they either lock you out with Opalescence plus Parallax Wave or answer your board, and this matchup is decided by racing their setup turns rather than a long grind. Keep pressure high early since Ancient Tomb lets them deploy Parallax Wave or Decree of Silence ahead of curve. Hold removal for Decree of Silence's cycling trigger window if possible, since it can counter a spell even when cycled.

Pyroclasm's 2 damage sweeps away Wild Mongrel, Werebear, and Weathered Wayfarer cleanly while also clipping Call of the Herd tokens, giving you a way to reset their board before Armageddon locks them ahead on lands. Cursed Scroll is the cut since it's slow and clunky against a deck that will often Armageddon away your mana advantage and leave you needing immediate impact rather than a stranded activated ability. Treetop Village and Mishra's Factory dodge Pyroclasm, so keep burn ready for those threats post-wipe. Watch out for Swords to Plowshares answering your bigger threats like Ball Lightning.