The Magic: The Gathering rat deck is one of the format’s most iconic underdogs: a mono-black swarm that buries opponents under a tide of cheap 1/1s, then turns that horde into lethal damage through token doublers, anthems, and sacrifice payoffs. Rats reward you for going wide and going low to the ground — and because most of the archetype’s best cards are cheap, it’s one of the friendliest decks for a new Commander player to build. This guide ranks the best rat commanders in MTG for 2026, lists the staples every rat deck wants, and walks you through building one from scratch — including a budget version under $50. (All prices verified June 2026 via Scryfall; cards shift over time.)

Best Rat Commanders in MTG (2026, Ranked)

Almost every rat deck lives in mono-black — it’s the color with the best token generation, sacrifice outlets, and graveyard recursion, all of which rats love. Here are the commanders actually worth building around, with current prices and what each one does best.

Marrow-Gnawer is the archetype’s beating heart: all your Rats gain fear (nearly unblockable), and you can tap-and-sacrifice a single Rat to create X tokens equal to the number of Rats you control. One activation can double your board, then you swing with evasion. It’s the most expensive option on this list (~$27) because it’s that good.

Karumonix, the Rat King is the best place for a beginner to start. At roughly a dollar it gives all your Rats toxic, makes early Rats cheaper, and lets you dig several cards deep for more Rats when it enters. Cheap, resilient, and self-refueling — everything a budget swarm wants.

Vren, the Relentless bends the archetype toward control: it exiles your opponents’ dying creatures and then hands you a pile of scaling rat tokens at each end step for doing it. In a meta full of removal and combat, Vren turns every kill into your army. A bargain at under 50 cents.

Rat King, Verminister is the newest darling — a two-mana engine that drips out rat tokens (with +1/+1 counters) whenever a permanent leaves your battlefield, and can sacrifice three Rats to mass-reanimate same-named cards. It’s tailor-made for a Relentless Rats build.

A quick honesty note on Wick, the Whorled Mind: data aggregators list Wick as the single most-played commander under the “Rats” tag, which makes it look like the default pick. It isn’t a classic rat deck. Wick is a Grixis (black-red-blue) commander that makes Snail tokens and sacrifices them for damage and cards — an aristocrats deck that happens to be a Rat. If you want the mono-black, go-wide rat-swarm experience most people mean by “rat deck,” start with Marrow-Gnawer or Karumonix. Wick is excellent, just a different deck.

Core Rat Staples Every Deck Wants

These cards form the backbone of nearly every rat deck regardless of which commander sits at the helm. Check live prices anytime with the KrakenTheMeta card price tool.

Anthems, Engines & Payoffs

A wide board of 1/1s does nothing without a way to make them big or unblockable. These are the cards that convert “a lot of rats” into “I win this turn”:

• Coat of Arms ({5}, ~$19) — every Rat gets +1/+1 for each other Rat. With 12 rats out, that’s a +11/+11 anthem. The classic tribal finisher.
• Cover of Darkness ({1}{B}, ~$20) — gives all your Rats fear, the cheapest mass-evasion in the deck.
• Throne of the God-Pharaoh ({2}, ~$7) — deals damage to each opponent equal to your tapped creatures at end of turn. Go wide, attack, and the leftovers still drain everyone out.
• Thrumming Stone ({5}, ~$22) — gives your spells Ripple 4. Cast one Relentless Rats and you may chain into a dozen more for free. The single most explosive card in the archetype.
• Skullclamp ({1}, ~$7) — equip a 1/1 Rat, it dies, draw two cards. With a board of expendable rats this is a bottomless draw engine.
• Patriarch’s Bidding ({3}{B}{B}, ~$5) — name “Rat” and reanimate your entire graveyard after a board wipe.
• Swarmyard (Land, ~$4) — regenerates your Rats; a free insurance land in mono-black.

How to Build an MTG Rat Deck: A 100-Card Blueprint

For a 100-card Commander deck, this ratio gives you a swarm that doesn’t choke on its own draws. Run it through the MTG Deck Analyzer to check your curve and color balance before you sleeve up.

New to the 100-card format entirely? Start with our step-by-step guide to building a Commander deck and the list of Commander staples every EDH deck wants, then layer the rat package on top.

Budget Rat Deck Under $50

Rats are one of the cheapest tribes to build, which is exactly why they’re a great first deck. Skip the $20+ cards (Thrumming Stone, Coat of Arms, Cover of Darkness) and the deck still hums:

• Commander: Karumonix, the Rat King (~$1)
• Engines: Pack Rat (~$3.30), Piper of the Swarm (~$3), Ogre Slumlord (~$0.45), a couple of Relentless Rats / Rat Colony (~$5–6 each — cap the copies to stay on budget)
• Payoffs/utility: Crypt Rats (~$0.50), Nezumi Bone-Reader (~$0.40), Bontu the Glorified (~$3) as a sac outlet, Throne of the God-Pharaoh only if budget allows
• The rest: cheap black removal, Swamps, and a Sol Ring

The whole list comes in well under $50, and it scales up gracefully — add Marrow-Gnawer and Thrumming Stone later and the same shell jumps several power levels.

Combos & How to Win

• Thrumming Stone + Relentless Rats: cast one Rat with Thrumming Stone out and Ripple can cascade you into a board of five-plus Rats off a single card. The archetype’s signature explosive turn.
• Marrow-Gnawer sac-loop: tap Marrow-Gnawer, sacrifice one Rat, make a token for every Rat you control — then swing with fear for a one-sided alpha strike.
• Pack Rat snowball: each copy makes every Pack Rat (and copy) bigger; a couple of activations is often a clock by itself.
• Coat of Arms overrun: drop the anthem on a wide board with menace or fear from Piper/Cover of Darkness and attack for lethal in one swing.
• Throne of the God-Pharaoh grind: can’t get through? Tap out attacking and drain each opponent for your tapped-creature count at end of turn anyway.

Common Rat Deck Mistakes

• No evasion. A wall of 1/1s gets chump-blocked forever. Always run fear/menace (Marrow-Gnawer, Cover of Darkness, Piper) or a Throne-style drain.
• Too few lands or too many “any number” rats. Twenty copies of Relentless Rats looks fun and plays clunky — you’ll flood on rats and starve for lands and payoffs. Keep ~36 lands and balance the swarm.
• No board-wipe insurance. Go-wide decks fold to a single sweeper. Run Patriarch’s Bidding or Bontu-style recursion so one wrath doesn’t end the game.
• Forgetting card draw. Cheap rats empty your hand fast. Skullclamp on expendable tokens is the fix — don’t skip it.

Rat Deck FAQ

What’s the best rat commander in MTG? For the classic mono-black swarm, Marrow-Gnawer (the iconic token doubler) or Karumonix (the budget pick). Wick, the Whorled Mind is the most-played commander under the “rats” tag, but it’s a Grixis snail-aristocrats deck rather than a true rat-tribal build.

What’s the best budget rat commander? Karumonix, the Rat King — about $1, and it functions as a lord, a discount, and a card-advantage engine all at once.

Can you really run any number of Relentless Rats and Rat Colony? Yes. Both cards override the singleton rule, so a Commander deck can include as many copies as you want. Note they only count cards of their own name — Relentless Rats don’t buff Rat Colony and vice versa, so pick one as your “any number” core.

How many rats should a rat deck run? Aim for roughly 25–35 Rats and token-makers in a 100-card deck — enough to power your lords and anthems without crowding out lands, ramp, and interaction.

Is a rat deck competitive? At the casual and mid-power tables, absolutely — it’s fast, resilient, and cheap. With Thrumming Stone, Marrow-Gnawer, and tight removal it can push into higher-power pods, though it’s not a cEDH staple.

Build Your Rat Swarm

Rats are proof that you don’t need a pile of mythic rares to build something that wins games — just a low curve, a token engine, and a way to get through. Plug your list into the MTG Deck Analyzer to tune the curve, browse community lists on the public decks page, or let the AI deck builder draft a rat shell for you in seconds. Create a free account to save and share your build.

Want more tribal guides? We’ve got the same deep-dive treatment for zombie commanders, dragons, and faeries — or start from the top with our overview of MTG tribes.

Card prices and Commander legality verified June 2026 via Scryfall. The Magic meta shifts — double-check current prices and any new rat commanders before you finalize a list.