Karumonix, the Rat King (Commander) - Expensive Relentless Rats

Jeremy Rowe
Mar 20, 2026
Building Rat Typal With Marrow-Gnawer
These Rats will do a lot more than pull your hair. Let's see what Marrow-Gnawer can do leading a swarm of Rats in Commander.
Deck Filters
Cardsphere
Archidekt
Commander Spellbook
Moxfield
Scryfall
MTGStocks
Relentless Rats
100%inclusion19 decks19 decks
98%synergy
Marrow-Gnawer
84%inclusion16 decks19 decks
81%synergy
Thrumming Stone
79%inclusion15 decks19 decks
75%synergy
Patriarch's Bidding
63%inclusion12 decks19 decks
59%synergy
Piper of the Swarm
58%inclusion11 decks19 decks
51%synergy
Ashcoat of the Shadow Swarm
53%inclusion10 decks19 decks
49%synergy
Kindred Dominance
53%inclusion10 decks19 decks
48%synergy
Ogre Slumlord
58%inclusion11 decks19 decks
48%synergy
Swarmyard
53%inclusion10 decks19 decks
47%synergy
Herald's Horn
53%inclusion10 decks19 decks
47%synergy
Top Cards
Dark Ritual
89%inclusion17 decks19 decks
23%synergy
Jet Medallion
89%inclusion17 decks19 decks
28%synergy
Phyrexian Arena
63%inclusion12 decks19 decks
23%synergy
Bontu's Monument
58%inclusion11 decks19 decks
30%synergy
Pack Rat
53%inclusion10 decks19 decks
47%synergy
Crypt Ghast
53%inclusion10 decks19 decks
5%synergy
Grim Tutor
53%inclusion10 decks19 decks
41%synergy
Deadly Rollick
47%inclusion9 decks19 decks
23%synergy
Black Market Connections
47%inclusion9 decks19 decks
24%synergy
Coat of Arms
42%inclusion8 decks19 decks
39%synergy
Game Changers
Vampiric Tutor
95%inclusion18 decks19 decks
74%synergy
Demonic Tutor
89%inclusion17 decks19 decks
62%synergy
Imperial Seal
53%inclusion10 decks19 decks
46%synergy
Ancient Tomb
37%inclusion7 decks19 decks
25%synergy
Bolas's Citadel
32%inclusion6 decks19 decks
3%synergy
Mana Vault
21%inclusion4 decks19 decks
14%synergy
The One Ring
16%inclusion3 decks19 decks
6%synergy
Necropotence
16%inclusion3 decks19 decks
1%synergy
Chrome Mox
16%inclusion3 decks19 decks
10%synergy
Opposition Agent
11%inclusion2 decks19 decks
1%synergy
Creatures
Lord Skitter, Sewer King
37%inclusion7 decks19 decks
29%synergy
Ink-Eyes, Servant of Oni
32%inclusion6 decks19 decks
28%synergy
Ratcatcher
32%inclusion6 decks19 decks
28%synergy
Lord Skitter's Butcher
26%inclusion5 decks19 decks
23%synergy
Ichor Rats
26%inclusion5 decks19 decks
23%synergy
Ayara, First of Locthwain
21%inclusion4 decks19 decks
-5%synergy
Filth
21%inclusion4 decks19 decks
19%synergy
Refurbished Familiar
20%inclusion3 decks15 decks
18%synergy
Crypt Rats
16%inclusion3 decks19 decks
11%synergy
Roaming Throne
16%inclusion3 decks19 decks
13%synergy
Gray Merchant of Asphodel
16%inclusion3 decks19 decks
-35%synergy
Species Specialist
16%inclusion3 decks19 decks
12%synergy
Adaptive Automaton
16%inclusion3 decks19 decks
15%synergy
Locust Miser
16%inclusion3 decks19 decks
14%synergy
Swarm of Rats
16%inclusion3 decks19 decks
13%synergy
Blightbelly Rat
16%inclusion3 decks19 decks
12%synergy
Septic Rats
16%inclusion3 decks19 decks
14%synergy
Typhoid Rats
16%inclusion3 decks19 decks
12%synergy
Ancient Cellarspawn
13%inclusion1 decks8 decks
10%synergy
Burglar Rat
11%inclusion2 decks19 decks
0%synergy
Sheoldred, the Apocalypse
11%inclusion2 decks19 decks
-4%synergy
Tangled Colony
11%inclusion2 decks19 decks
7%synergy
Nirkana Revenant
11%inclusion2 decks19 decks
0%synergy
Voracious Vermin
11%inclusion2 decks19 decks
8%synergy
Gnat Miser
11%inclusion2 decks19 decks
8%synergy
Nashi, Moon Sage's Scion
11%inclusion2 decks19 decks
7%synergy
Rancid Rats
11%inclusion2 decks19 decks
8%synergy
Valley Rotcaller
10%inclusion1 decks10 decks
7%synergy
Patron of the Nezumi
5.3%inclusion1 decks19 decks
5%synergy
Mirkwood Bats
5.3%inclusion1 decks19 decks
-3%synergy
Chittering Rats
5.3%inclusion1 decks19 decks
5%synergy
Illuminor Szeras
5.3%inclusion1 decks19 decks
1%synergy
Nezumi Graverobber
5.3%inclusion1 decks19 decks
4%synergy
Magus of the Coffers
5.3%inclusion1 decks19 decks
-2%synergy
Priest of Forgotten Gods
5.3%inclusion1 decks19 decks
-3%synergy
Hell's Caretaker
5.3%inclusion1 decks19 decks
4%synergy
Ravenous Rats
5.3%inclusion1 decks19 decks
3%synergy
Necrotic Ooze
5.3%inclusion1 decks19 decks
1%synergy
Blood Artist
5.3%inclusion1 decks19 decks
-26%synergy
Crashing Drawbridge
5.3%inclusion1 decks19 decks
3%synergy
Throat Slitter
5.3%inclusion1 decks19 decks
3%synergy
Mikaeus, the Unhallowed
5.3%inclusion1 decks19 decks
-3%synergy
Canoptek Wraith
5.3%inclusion1 decks19 decks
3%synergy
Grim Haruspex
5.3%inclusion1 decks19 decks
-4%synergy
Zulaport Cutthroat
5.3%inclusion1 decks19 decks
-18%synergy
Kozilek, Butcher of Truth
5.3%inclusion1 decks19 decks
5%synergy
Burnished Hart
5.3%inclusion1 decks19 decks
-2%synergy
Yawgmoth, Thran Physician
5.3%inclusion1 decks19 decks
-5%synergy
Changeling Outcast
5.3%inclusion1 decks19 decks
0%synergy
Nezumi Informant
5.3%inclusion1 decks19 decks
-1%synergy
Instants
Archenemy's Charm
100%inclusion1 decks1 decks
91%synergy
Village Rites
37%inclusion7 decks19 decks
11%synergy
Go for the Throat
21%inclusion4 decks19 decks
-2%synergy
Tainted Strike
21%inclusion4 decks19 decks
18%synergy
Vraska's Fall
16%inclusion3 decks19 decks
12%synergy
Deadly Dispute
16%inclusion3 decks19 decks
-10%synergy
Defile
16%inclusion3 decks19 decks
-21%synergy
Cabal Ritual
16%inclusion3 decks19 decks
-2%synergy
Foul-Tongue Shriek
16%inclusion3 decks19 decks
14%synergy
Flare of Malice
13%inclusion2 decks15 decks
0%synergy
Breathe Your Last
13%inclusion2 decks15 decks
11%synergy
Withering Torment
13%inclusion1 decks8 decks
-19%synergy
Hero's Downfall
11%inclusion2 decks19 decks
4%synergy
Force of Despair
11%inclusion2 decks19 decks
3%synergy
Sheoldred's Edict
11%inclusion2 decks19 decks
-4%synergy
Entomb
11%inclusion2 decks19 decks
-2%synergy
Snuff Out
11%inclusion2 decks19 decks
-2%synergy
Heartless Act
11%inclusion2 decks19 decks
9%synergy
Doom Blade
11%inclusion2 decks19 decks
3%synergy
Culling the Weak
11%inclusion2 decks19 decks
-5%synergy
Withering Boon
11%inclusion2 decks19 decks
6%synergy
Bitter Triumph
11%inclusion2 decks19 decks
1%synergy
Infernal Grasp
11%inclusion2 decks19 decks
-15%synergy
Sudden Spoiling
11%inclusion2 decks19 decks
2%synergy
Dismember
11%inclusion2 decks19 decks
0%synergy
Fell the Profane
6.7%inclusion1 decks15 decks
-12%synergy
Consuming Corruption
6.7%inclusion1 decks15 decks
-9%synergy
Hagra Mauling
5.3%inclusion1 decks19 decks
1%synergy
Cut Down
5.3%inclusion1 decks19 decks
1%synergy
Whisper of the Dross
5.3%inclusion1 decks19 decks
2%synergy
Scour from Existence
5.3%inclusion1 decks19 decks
5%synergy
Imp's Mischief
5.3%inclusion1 decks19 decks
-19%synergy
Rat Out
5.3%inclusion1 decks19 decks
4%synergy
Anoint with Affliction
5.3%inclusion1 decks19 decks
5%synergy
Grim Affliction
5.3%inclusion1 decks19 decks
3%synergy
Grasp of Darkness
5.3%inclusion1 decks19 decks
3%synergy
Soul Shatter
5.3%inclusion1 decks19 decks
-7%synergy
Dash Hopes
5.3%inclusion1 decks19 decks
4%synergy
Murder
5.3%inclusion1 decks19 decks
-5%synergy
Spoils of Evil
5.3%inclusion1 decks19 decks
5%synergy
Malakir Rebirth
5.3%inclusion1 decks19 decks
-18%synergy
Plumb the Forbidden
5.3%inclusion1 decks19 decks
1%synergy
Corrupted Conviction
5.3%inclusion1 decks19 decks
-7%synergy
Warping Wail
5.3%inclusion1 decks19 decks
5%synergy
Gravepurge
5.3%inclusion1 decks19 decks
4%synergy
Sorceries
Feed the Swarm
37%inclusion7 decks19 decks
-14%synergy
Sign in Blood
37%inclusion7 decks19 decks
1%synergy
Damnation
37%inclusion7 decks19 decks
16%synergy
Diabolic Intent
32%inclusion6 decks19 decks
17%synergy
Echoing Return
26%inclusion5 decks19 decks
23%synergy
Torment of Hailfire
16%inclusion3 decks19 decks
0%synergy
Bubbling Muck
16%inclusion3 decks19 decks
0%synergy
Toxic Deluge
16%inclusion3 decks19 decks
-21%synergy
Crippling Fear
16%inclusion3 decks19 decks
13%synergy
Diabolic Tutor
11%inclusion2 decks19 decks
-4%synergy
Phyresis Outbreak
11%inclusion2 decks19 decks
9%synergy
Agadeem's Awakening
11%inclusion2 decks19 decks
3%synergy
Read the Bones
11%inclusion2 decks19 decks
-6%synergy
Infectious Inquiry
11%inclusion2 decks19 decks
8%synergy
Night's Whisper
11%inclusion2 decks19 decks
-14%synergy
Living Death
11%inclusion2 decks19 decks
0%synergy
Reanimate
11%inclusion2 decks19 decks
-29%synergy
Insatiable Avarice
11%inclusion2 decks19 decks
-1%synergy
Cruel Tutor
11%inclusion2 decks19 decks
9%synergy
Final Act
5.9%inclusion1 decks17 decks
4%synergy
Plague Wind
5.3%inclusion1 decks19 decks
4%synergy
Profane Tutor
5.3%inclusion1 decks19 decks
1%synergy
Nightmare Unmaking
5.3%inclusion1 decks19 decks
5%synergy
Dread Return
5.3%inclusion1 decks19 decks
-7%synergy
Infernal Tutor
5.3%inclusion1 decks19 decks
5%synergy
Mutilate
5.3%inclusion1 decks19 decks
-12%synergy
Exsanguinate
5.3%inclusion1 decks19 decks
-19%synergy
Final Parting
5.3%inclusion1 decks19 decks
1%synergy
In Garruk's Wake
5.3%inclusion1 decks19 decks
1%synergy
Gruesome Fate
5.3%inclusion1 decks19 decks
3%synergy
Beseech the Queen
5.3%inclusion1 decks19 decks
-1%synergy
Drown in Ichor
5.3%inclusion1 decks19 decks
1%synergy
Rise of the Dark Realms
5.3%inclusion1 decks19 decks
-8%synergy
Chain of Smog
5.3%inclusion1 decks19 decks
1%synergy
Thoughtseize
5.3%inclusion1 decks19 decks
0%synergy
Pact of the Serpent
5.3%inclusion1 decks19 decks
4%synergy
Secret Salvage
5.3%inclusion1 decks19 decks
4%synergy
Utility Artifacts
Chronicle of Victory
100%inclusion1 decks1 decks
97%synergy
Vanquisher's Banner
42%inclusion8 decks19 decks
38%synergy
Lightning Greaves
37%inclusion7 decks19 decks
3%synergy
Skullclamp
26%inclusion5 decks19 decks
4%synergy
Door of Destinies
26%inclusion5 decks19 decks
24%synergy
Banner of Kinship
17%inclusion1 decks6 decks
14%synergy
Whip of Erebos
16%inclusion3 decks19 decks
5%synergy
Chimil, the Inner Sun
11%inclusion2 decks19 decks
10%synergy
Elixir of Immortality
11%inclusion2 decks19 decks
8%synergy
Contagion Engine
11%inclusion2 decks19 decks
9%synergy
Ashnod's Altar
11%inclusion2 decks19 decks
-9%synergy
Phyrexian Altar
11%inclusion2 decks19 decks
-3%synergy
Akroma's Memorial
11%inclusion2 decks19 decks
10%synergy
Urza's Incubator
11%inclusion2 decks19 decks
9%synergy
Eldrazi Monument
11%inclusion2 decks19 decks
9%synergy
Swiftfoot Boots
11%inclusion2 decks19 decks
-21%synergy
Sensei's Divining Top
5.3%inclusion1 decks19 decks
-3%synergy
Icon of Ancestry
5.3%inclusion1 decks19 decks
4%synergy
Stone Calendar
5.3%inclusion1 decks19 decks
5%synergy
Wayfarer's Bauble
5.3%inclusion1 decks19 decks
-10%synergy
Manifold Key
5.3%inclusion1 decks19 decks
3%synergy
Umbral Mantle
5.3%inclusion1 decks19 decks
5%synergy
The Immortal Sun
5.3%inclusion1 decks19 decks
5%synergy
Cloudstone Curio
5.3%inclusion1 decks19 decks
5%synergy
Aetherflux Reservoir
5.3%inclusion1 decks19 decks
-4%synergy
Nim Deathmantle
5.3%inclusion1 decks19 decks
2%synergy
Font of Mythos
5.3%inclusion1 decks19 decks
3%synergy
Hall of Triumph
5.3%inclusion1 decks19 decks
5%synergy
Sword of Truth and Justice
5.3%inclusion1 decks19 decks
5%synergy
Stoneforge Masterwork
5.3%inclusion1 decks19 decks
5%synergy
Expedition Map
5.3%inclusion1 decks19 decks
-7%synergy
Sword of Hearth and Home
5.3%inclusion1 decks19 decks
4%synergy
Horn of the Mark
5.3%inclusion1 decks19 decks
5%synergy
Navigation Orb
5.3%inclusion1 decks19 decks
5%synergy
Altar of the Brood
5.3%inclusion1 decks19 decks
3%synergy
Sword of the Paruns
5.3%inclusion1 decks19 decks
5%synergy
Howling Mine
5.3%inclusion1 decks19 decks
1%synergy
Dolmen Gate
5.3%inclusion1 decks19 decks
5%synergy
Sword of the Animist
5.3%inclusion1 decks19 decks
1%synergy
Thornbite Staff
5.3%inclusion1 decks19 decks
2%synergy
Helm of Awakening
5.3%inclusion1 decks19 decks
4%synergy
Enchantments
Grave Pact
32%inclusion6 decks19 decks
12%synergy
Cover of Darkness
32%inclusion6 decks19 decks
29%synergy
Black Market
21%inclusion4 decks19 decks
0%synergy
Bad Moon
21%inclusion4 decks19 decks
18%synergy
The Meathook Massacre
16%inclusion3 decks19 decks
-2%synergy
Haunted One
16%inclusion3 decks19 decks
13%synergy
Dictate of Erebos
16%inclusion3 decks19 decks
5%synergy
Oversold Cemetery
16%inclusion3 decks19 decks
10%synergy
Necromancy
11%inclusion2 decks19 decks
5%synergy
Phyresis
11%inclusion2 decks19 decks
8%synergy
Animate Dead
11%inclusion2 decks19 decks
-7%synergy
Nowhere to Run
8.3%inclusion1 decks12 decks
5%synergy
Necrodominance
6.7%inclusion1 decks15 decks
4%synergy
Chthonian Nightmare
5.9%inclusion1 decks17 decks
2%synergy
Greed
5.3%inclusion1 decks19 decks
-2%synergy
Contamination
5.3%inclusion1 decks19 decks
2%synergy
Glistening Oil
5.3%inclusion1 decks19 decks
5%synergy
Phyrexian Reclamation
5.3%inclusion1 decks19 decks
-5%synergy
Relic Putrescence
5.3%inclusion1 decks19 decks
5%synergy
Carnival of Souls
5.3%inclusion1 decks19 decks
4%synergy
Dauthi Embrace
5.3%inclusion1 decks19 decks
4%synergy
Bastion of Remembrance
5.3%inclusion1 decks19 decks
-12%synergy
Lord Skitter's Blessing
5.3%inclusion1 decks19 decks
5%synergy
Heartless Summoning
5.3%inclusion1 decks19 decks
0%synergy
Necrogen Communion
5.3%inclusion1 decks19 decks
3%synergy
Planeswalkers
Vraska, Betrayal's Sting
16%inclusion3 decks19 decks
13%synergy
Liliana of the Dark Realms
16%inclusion3 decks19 decks
2%synergy
Professor Onyx
5.3%inclusion1 decks19 decks
-1%synergy
Utility Lands
Cabal Coffers
95%inclusion18 decks19 decks
40%synergy
Urborg, Tomb of Yawgmoth
74%inclusion14 decks19 decks
36%synergy
Nykthos, Shrine to Nyx
63%inclusion12 decks19 decks
33%synergy
Cabal Stronghold
53%inclusion10 decks19 decks
18%synergy
Three Tree City
50%inclusion5 decks10 decks
45%synergy
Bojuka Bog
42%inclusion8 decks19 decks
-5%synergy
Crypt of Agadeem
37%inclusion7 decks19 decks
26%synergy
Phyrexian Tower
32%inclusion6 decks19 decks
6%synergy
Reliquary Tower
26%inclusion5 decks19 decks
-4%synergy
Mudflat Village
25%inclusion3 decks12 decks
22%synergy
Karn's Bastion
21%inclusion4 decks19 decks
17%synergy
Takenuma, Abandoned Mire
21%inclusion4 decks19 decks
5%synergy
Castle Locthwain
21%inclusion4 decks19 decks
4%synergy
Rogue's Passage
21%inclusion4 decks19 decks
2%synergy
Shizo, Death's Storehouse
16%inclusion3 decks19 decks
6%synergy
Mortuary Mire
16%inclusion3 decks19 decks
3%synergy
Witch's Cottage
16%inclusion3 decks19 decks
-9%synergy
Lake of the Dead
16%inclusion3 decks19 decks
11%synergy
Vesuva
11%inclusion2 decks19 decks
8%synergy
War Room
11%inclusion2 decks19 decks
-6%synergy
Volrath's Stronghold
11%inclusion2 decks19 decks
7%synergy
Minas Morgul, Dark Fortress
11%inclusion2 decks19 decks
7%synergy
Everglades
11%inclusion2 decks19 decks
9%synergy
Spymaster's Vault
6.7%inclusion1 decks15 decks
-3%synergy
Vault of Whispers
5.3%inclusion1 decks19 decks
0%synergy
Wasteland
5.3%inclusion1 decks19 decks
4%synergy
Desert of the Glorified
5.3%inclusion1 decks19 decks
3%synergy
Ghost Quarter
5.3%inclusion1 decks19 decks
3%synergy
Barren Moor
5.3%inclusion1 decks19 decks
-5%synergy
Maze of Ith
5.3%inclusion1 decks19 decks
2%synergy
Blinkmoth Nexus
5.3%inclusion1 decks19 decks
5%synergy
Ebon Stronghold
5.3%inclusion1 decks19 decks
4%synergy
Crystal Vein
5.3%inclusion1 decks19 decks
3%synergy
Command Beacon
5.3%inclusion1 decks19 decks
-3%synergy
Deserted Temple
5.3%inclusion1 decks19 decks
1%synergy
Peat Bog
5.3%inclusion1 decks19 decks
3%synergy
Thespian's Stage
5.3%inclusion1 decks19 decks
0%synergy
Unholy Grotto
5.3%inclusion1 decks19 decks
3%synergy
Dark Depths
5.3%inclusion1 decks19 decks
5%synergy
Strip Mine
5.3%inclusion1 decks19 decks
2%synergy
Access Tunnel
5.3%inclusion1 decks19 decks
2%synergy
Mana Artifacts
Sol Ring
100%inclusion19 decks19 decks
14%synergy
Arcane Signet
53%inclusion10 decks19 decks
-9%synergy
Patchwork Banner
40%inclusion4 decks10 decks
36%synergy
Thought Vessel
26%inclusion5 decks19 decks
1%synergy
Glistening Sphere
21%inclusion4 decks19 decks
20%synergy
Jeweled Lotus
21%inclusion4 decks19 decks
20%synergy
Lotus Petal
21%inclusion4 decks19 decks
14%synergy
Throne of Eldraine
16%inclusion3 decks19 decks
6%synergy
Mind Stone
16%inclusion3 decks19 decks
-13%synergy
Sceptre of Eternal Glory
16%inclusion3 decks19 decks
7%synergy
Caged Sun
11%inclusion2 decks19 decks
-1%synergy
Charcoal Diamond
11%inclusion2 decks19 decks
-12%synergy
Mana Crypt
11%inclusion2 decks19 decks
9%synergy
Heraldic Banner
11%inclusion2 decks19 decks
5%synergy
Mox Amber
11%inclusion2 decks19 decks
6%synergy
Decanter of Endless Water
11%inclusion2 decks19 decks
8%synergy
Fellwar Stone
11%inclusion2 decks19 decks
-4%synergy
Mox Diamond
11%inclusion2 decks19 decks
7%synergy
Commander's Sphere
5.3%inclusion1 decks19 decks
-3%synergy
Gauntlet of Power
5.3%inclusion1 decks19 decks
2%synergy
Staff of Compleation
5.3%inclusion1 decks19 decks
4%synergy
Skull of Ramos
5.3%inclusion1 decks19 decks
5%synergy
Nyx Lotus
5.3%inclusion1 decks19 decks
-1%synergy
Mox Opal
5.3%inclusion1 decks19 decks
2%synergy
Lands
Swamp
95%inclusion18 decks19 decks
0%synergy
Cavern of Souls
32%inclusion6 decks19 decks
25%synergy
Path of Ancestry
26%inclusion5 decks19 decks
21%synergy
Command Tower
11%inclusion2 decks19 decks
5%synergy
Myriad Landscape
11%inclusion2 decks19 decks
-15%synergy
Agadeem's Awakening
11%inclusion2 decks19 decks
3%synergy
Fell the Profane
6.7%inclusion1 decks15 decks
-12%synergy
Hagra Mauling
5.3%inclusion1 decks19 decks
1%synergy
Prismatic Vista
5.3%inclusion1 decks19 decks
3%synergy
Fabled Passage
5.3%inclusion1 decks19 decks
3%synergy
Terramorphic Expanse
5.3%inclusion1 decks19 decks
3%synergy
Urza's Cave
5.3%inclusion1 decks19 decks
-3%synergy
Verdant Catacombs
5.3%inclusion1 decks19 decks
2%synergy
Malakir Rebirth
5.3%inclusion1 decks19 decks
-18%synergy
Evolving Wilds
5.3%inclusion1 decks19 decks
2%synergy
Snow-Covered Swamp
5.3%inclusion1 decks19 decks
-1%synergy
Marsh Flats
5.3%inclusion1 decks19 decks
2%synergy
Polluted Delta
5.3%inclusion1 decks19 decks
2%synergy
Bloodstained Mire
5.3%inclusion1 decks19 decks
2%synergy