This is going to be a rat tribal deck with an aristocrat subtheme.
Karumonix really rewards us for jamming the deck full of rats, giving all of them toxic 1 means that only 10 of them ever have to get through over the course of a game to take out a player, that’s a lot less than dealing 40 damage, and is a really solid win condition.

https://tappedout.net/mtg-decks/karumonix-the-rat-king-suggestions/?cb=1676453097

Rat Tribal (20-36)
Rat Colony
Thrumming Stone
Marrow-Gnawer
Piper of the Swarm
Ogre Slumlord
Swarm of Rats
Pack Rat
Gnat Miser
Locust Miser
Ratcatcher
Ashcoat of the Shadow Swarm
Coat of Arms
Eldrazi Monument
Vanquisher's Banner
Obelisk of Urd

Aristocrat Package (6-8)
Ayara, First of Locthwain
Zulaport Cutthroat
Bastion of Remembrance
Syr Konrad, the Grim
Nezumi Bone-Reader
Ashnod's Altar
Haunted One
Malakir Rebirth
Undying Evil
Undying Malice

Card Draw (8+)
Species Specialist
Chittering Skitterling
Wave of Rats
Nashi, Moon Sage's Scion
Gix, Yawgmoth Praetor
Vampiric Rites
Dark Prophecy
Phyrexian Arena
Skullclamp
Bolas's Citadel

Ramp (8-10)
Dark Ritual
Bontu's Monument
Herald's Horn
Sol Ring
Arcane Signet
Charcoal Diamond
Fellwar Stone
Crypt Ghast
Caged Sun

Interaction (8+)
Chittering Witch
Throat Slitter
Crypt Rats
Drown in Ichor
Kindred Dominance
Feed the Swarm
Infernal Grasp
Damnation
Mutilate

Recursion (2-4)
Patriarch's Bidding
Phyrexian Reclamation
Oversold Cemetery
Graveshifter
Ink-Eyes, Servant of Oni

Wincons
Ichor Rats
Septic Rats
Vraska, Betrayal's Sting
Gray Merchant of Asphodel
Patron of the Nezumi
Plague of Vermin

Utility Lands
Swarmyard
War Room
Karn's Bastion
Cabal Coffers
Urborg, Tomb of Yawgmoth
Bojuka Bog
Mortuary Mire
Phyrexian Tower

How to build a budget mana base Part One: https://youtu.be/fqT-JuV03_I

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