Karumonix turns a mono-black Rat tribal swarm into a poison deck: every other Rat gets toxic 1, so each Rat that connects adds a poison counter on top of its damage. The deck floods the board with cheap Rats and Rat tokens, then makes them evasive, pumped or deathtouch-armed so they get through. Proliferate effects and incidental poison sources push opponents toward ten counters faster than combat alone could. How it wins: The deck wins mainly by poison, landing a wide, evasive wave of toxic and infect Rats and then proliferating to finish, with plain combat damage from huge Rat lords and Grave Pact lockdowns as backup. Key roles: - Rat swarm generation: Recurring and explosive token makers multiply the number of toxic bodies, so each attack spreads more poison and feeds the Rat-count payoffs (Lord Skitter, Sewer King, Marrow-Gnawer, Pack Rat). - Evasion and anthems: Effects that grant fear, menace or deathtouch, or scale with the number of Rats, let a board of small toxic creatures connect en masse or become lethal through damage alone (Piper of the Swarm, Ashcoat of the Shadow Swarm, Cover of Darkness). - Poison and proliferate finishers: Infect creatures, poison-adding spells and proliferate effects turn a few connected hits into a lethal poison total, and corrupted mana rewards getting opponents to three counters (Vraska, Betrayal's Sting, Grim Affliction, Glistening Sphere). - Rat card advantage and tutoring: Karumonix's enter trigger, repeatable Rat searches and tribal draw engines keep the hand stocked with creatures, while cost reducers let several be cast per turn (Ratcatcher, Vanquisher's Banner, Herald's Horn). - Sacrifice value and one-sided board control: Expendable Rats become fuel for card draw and for opponents' sacrifices, and tribal sweepers or Crypt Rats clear blockers while the Rats survive or rebuild (Grave Pact, Skullclamp, Kindred Dominance). - Graveyard recursion: Rats return from the graveyard to hand or straight back into combat, so the swarm persists through removal and wraths (Ashcoat of the Shadow Swarm, Persistent Marshstalker, Necrogen Communion).

Karumonix, the Rat King decklist

• Arcane Signet
• Bontu's Monument
• Glistening Sphere
• Herald's Horn
• Jet Medallion
• Patchwork Banner
• Skullclamp
• Sol Ring
• Thrumming Stone
• Vanquisher's Banner
• Bojuka Bog
• Cabal Coffers
• Karn's Bastion
• Mudflat Village
• Path of Ancestry
• Rogue's Passage
• 25× Swamp
• Swarmyard
• Urborg, Tomb of Yawgmoth
• Witch's Cottage
• Ashcoat of the Shadow Swarm
• Blightbelly Rat
• Burglar Rat
• Crypt Rats
• Gnat Miser
• Ichor Rats
• Lord Skitter's Butcher
• Lord Skitter, Sewer King
• Marrow-Gnawer
• Ogre Slumlord
• Pack Rat
• Persistent Marshstalker
• Piper of the Swarm
• Rancid Rats
• 13× Rat Colony
• Ratcatcher
• Septic Rats
• Stronghold Rats
• Tangled Colony
• Typhoid Rats
• Voracious Vermin
• Cover of Darkness
• Grave Pact
• Necrogen Communion
• Phyrexian Arena
• Dark Ritual
• Defile
• Go for the Throat
• Grim Affliction
• Vampiric Tutor
• Village Rites
• Vraska's Fall
• Whisper of the Dross
• Vraska, Betrayal's Sting
• Crippling Fear
• Demonic Tutor
• Drown in Ichor
• Feed the Swarm
• Infectious Inquiry
• Kindred Dominance
• Swamp
• Swamp
• Swamp