Mainboard (61)
Creatures (6)
Instants (20)
Sorceries (2)
Artifacts (14)
Lands (19)
Mono Red Madness wins by flooding the board with cheap creatures like Voldaren Epicure and Sneaky Snacker and backing them up with a critical mass of direct damage spells. Weather the Storm is your premier sideboard card here — each copy can gain 6+ life in a single turn when they're chaining spells, dramatically extending your life total until Crypt Rats or Drown in Sorrow can stabilize. Drown in Sorrow sweeps their entire creature base, and combined with the two copies already in your main deck, you have strong sweeper density. Snuff Out comes out because paying 4 life against an aggro deck is dangerous, and Nihil Spellbomb is narrow since their graveyard interaction is incidental rather than a core engine. Troll of Khazad-dum is too slow for this matchup; prioritize removal and life gain to survive long enough for Crypt Rats to take over.
Grixis Affinity is a synergy-driven artifact deck that wins by churning through its deck with Ichor Wellspring, Thoughtcast, and Reckoner's Bargain, then threatening lethal with large Myr Enforcers and Utrom Monitors. Troublemaker Ouphe is your most impactful card — it shuts off their artifact-based card draw engines (Ichor Wellspring, Nihil Spellbomb, Blood Fountain) and their sacrifice outlets, grinding their gameplan to a halt. Evil Presence converts their artifact lands (Great Furnace, Vault of Whispers, Seat of the Synod) into basic Swamps, stranding colored mana requirements and reducing artifact count to hinder Myr Enforcer. Nihil Spellbomb comes out because it doesn't interact favorably here and they play their own copies; Drown in Sorrow is too slow against a deck that goes wide with 4/4s, and Lembas is cut as a low-impact card in a race where disrupting their engine is more important than gaining life. Cast Down, Defile, Crypt Rats, and Snuff Out remain in as your primary interaction suite to answer their threats.
Dimir Terror is a tempo-control deck that wins by resolving large delve threats like Tolarian Terror and Gurmag Angler backed by Counterspell and Snuff Out. Evil Presence is a key tool here, turning their Islands into Swamps to dramatically reduce the number of blue sources available for Counterspell, Brainstorm, and Lorien Revealed while also taxing delve enablers by disrupting their mana base. Faerie Macabre comes in as a flash, uncounterable graveyard hate that can exile cards in response to delve activations, shrinking their threats or making them uncastable. Drown in Sorrow and the third Nihil Spellbomb come out since this deck runs very few creatures, and Snuff Out is a lower-priority removal spell when Cast Down already handles their threats cleanly. Focus on deploying your engines (Ichor Wellspring, Eviscerator's Insight) and leveraging Crypt Rats as a persistent threat and board presence that pressures their relatively thin creature base.