Pyroblast and Red Elemental Blast have no legal targets since the opponent's manabase is all Mountain, so they stay in the sideboard. Breath Weapon's 2 damage sweeps away Voldaren Epicure, Sneaky Snacker, and Guttersnipe, though Kessig Flamebreather survives at 1/3; it is best used proactively before they chain spells rather than reactively. Loyal Sentry trades with any attacker, giving a cheap blocker against their small ground creatures. Keep Skred, Dispel, and Counterspell as your core interaction, and Ephemerate plus Murmuring Mystic to race and block with tokens. Ride's End is too slow and clunky against a deck trying to kill you outright, and Fanged Flames is a fine cut since this matchup rarely cares about exiling a creature.

Dimir Control has no red cards, so Hydroblast is dead since they cast no red spells or permanents. Pyroblast is live, though, because it counters or destroys blue spells and permanents, and much of their deck is blue: Counterspell, Dispel, Brainstorm, Lorien Revealed, Spellstutter Sprite, Faerie Seer, Ninja of the Deep Hours and Baleful Strix. Their only mainboard artifacts are artifact creatures (Baleful Strix, Mukotai Ambusher), and Dust to Dust needs two artifact targets, so it is too narrow to bring in. Breath Weapon would hit our own creatures too, so it stays out. This is a grindy matchup best fought with the existing Counterspell, Dispel, and card draw suite (Lorien Revealed, Preordain, Brainstorm) to out-value their Baleful Strix and Spellstutter Sprite, with Pyroblast as extra interaction against their blue spells and creatures. Ephemerate plus Mulldrifter/Archaeomancer keeps generating card advantage to match their Thorn of the Black Rose monarch plan, so only a small Pyroblast swap is needed and the rest of the 75 stays as is.

Spy Combo relies on filling its graveyard with creatures via Balustrade Spy and then reanimating a huge threat with Dread Return; Crypt Incursion exiles their graveyard's creature cards and gains life, directly disrupting the reanimation target and buying time. Goliath Paladin is a resilient 3/6 vigilance body that blocks well against their ramp-into-big-creature plan and takes the initiative. Ride's End is clunky against a deck that isn't really attacking with Vehicles or many relevant tapped targets early, and Fanged Flames is a low-impact cut. Keep Counterspell and Dispel up to disrupt Dread Return or key draw spells like Lead the Stampede.