Mainboard (60)
Creatures (12)
Sorceries (4)
Artifacts (18)
Lands (11)
Sideboard (15)
Mono-Red Madness is a fast burn deck that wins by dumping damage through Kessig Flamebreather, Guttersnipe, and direct spells like Lightning Bolt and Fiery Temper, so gaining life quickly is your top priority — Weather the Storm can gain 6 or more life in a single cast when you're chaining spells, and it's your best tool to stabilize. Breath Weapon is your sweeper of choice, clearing Voldaren Epicure and Sneaky Snacker while threatening to take down Kessig Flamebreather if you've cast multiple colored spells in a turn, which this deck can do naturally. Toxin Analysis comes out because the proliferate/poison plan does nothing to interact with their game plan, and Lembas is too slow compared to the instant-speed life gain Weather the Storm provides. Keep Krark-Clan Shaman in — repeatedly pinging their small creatures for 1 each time you sacrifice an artifact can break up their synergies and is a real threat they must answer. Your Nihil Spellbomb also stays in mostly as an engine piece, though shaving one copy is fine since it has limited graveyard utility against Madness triggers.
Grixis Affinity is a mirror-adjacent matchup where both decks grind through artifacts and card draw, but they add Thoughtcast, Myr Enforcer, and Utrom Monitor for a more explosive late game backed by Galvanic Blast for interaction. Bring in Pyroblast to counter their Thoughtcasts and disrupt tempo plays, as counterspell protection is critical in this grindy artifact matchup. Cut Lembas and the singleton Makeshift Munitions, as the life gain plan is too slow against their clock and Munitions is a win-more card when you'd rather be deploying interaction. Krark-Clan Shaman is a key piece on both sides — use yours proactively to wipe their small artifact tokens and Refurbished Familiars before they snowball, and watch out for theirs doing the same to you. Focus on leveraging Cleansing Wildfire and Writhing Chrysalis to establish board presence while using Nihil Spellbomb to disrupt any graveyard synergies from Blood Fountain or Reckoner's Bargain.
Dimir Terror is a tempo-control deck that wins by filling its graveyard quickly to power out cheap Tolarian Terrors and Gurmag Anglers, backed by Counterspell and Snuff Out. Pyroblast comes in as hard interaction against their blue threats and counters, answering Tolarian Terror, Brainstorm, and Counterspell cleanly. Extract a Confession disrupts their hand and exiles graveyard cards, hitting the delve enablers before they become threats. Nihil Spellbomb comes out because it doesn't generate enough value when their graveyard hate (Nihil Spellbomb, Annul) will often be aimed at your artifacts, and Lembas is too slow in a race where tempo matters. Krark-Clan Shaman is a key card to protect — it can sweep their Sneaky Snackers — so avoid boarding it out.