Fiery Cannonade sweeps for 2, killing Voldaren Epicure, Sneaky Snacker, and Guttersnipe (but not the 1/3 Kessig Flamebreather), while Electrickery can be overloaded to clean up Epicures and Snackers for just {1}{R}. Both answers hit multiple key engine pieces at once, which is critical since this is a race and every creature they lose slows their damage output. Red Elemental Blast and Pyroblast stay boarded since their only blue card, Sneaky Snacker, never gets cast and graveyard hate does nothing against madness cast from exile. Trim slower card-advantage pieces like Highway Robbery and the lone Sazacap's Brew since this matchup is decided by who deals lethal first, not by grinding.

Red Elemental Blast is excellent here: it counters Counterspell, Dispel, Brainstorm, or Lorien Revealed, or destroys Spellstutter Sprite, Faerie Seer, Ninja of the Deep Hours, and Baleful Strix, giving you a cheap way to blow through their permission suite or remove a card-advantage creature. Alms of the Vein is the weakest mainboard card against a deck full of cheap removal and counterspells that can simply answer your threats before the drain matters. Keep the rest of the burn suite intact since Dimir Control has few ways to interact with direct damage to the face once the counters are used up.

Spy Combo wants to dump creatures into the graveyard via Balustrade Spy, Winding Way, and Dread Return/flashback effects to enable its reanimation and self-mill payoffs, so Nihil Spellbomb exiling a graveyard disrupts Dread Return targets and denies fuel for their engine while still cantripping for a card when it dies. This is otherwise a good matchup for your aggressive burn plan since their deck is mostly small mana creatures (Overgrown Battlement, Wall of Roots, Saruli Caretaker) that can't block fliers or stop direct damage. Keep the burn suite maximized to close the game before they assemble Troll of Khazad-dum or a reanimated Generous Ent. Cut only the single copy Sazacap's Brew, which is the least impactful card advantage piece against a deck that isn't racing you on damage.