Mono Red Rally floods the board with cheap creatures and artifacts (Burning-Tree Emissary, Clockwork Percussionist, tokens from Rally at the Hornburg and Goblin Bushwhacker) then swings for lethal in one turn, so Fiery Cannonade is your premier sweeper and should stay at full count to wipe their 1-toughness swarm. Cast into the Fire adds more cheap removal that can snipe two small creatures at once before they combo off, buying crucial time. Tormod's Crypt can exile Clockwork Percussionist's death trigger target zone is the exile-until-end-of-next-turn effect from the library, not graveyard, but Crypt still has marginal value against any incidental graveyard synergies; treat it as a low-impact speculative include. Spell Pierce is weak against their cheap, mana-neutral sequencing, so trim it along with a Preordain for the additional sweeper effect.