Quick Answer

Karumonix, the Rat King is a rare Legendary Creature — Phyrexian Rat from ONE (ONE) costing {1}{B}{B}. Current price: $0.58 USD. Legal in Modern. Legal in Commander.

Karumonix, the Rat King MTG card

Karumonix, the Rat King

Legendary Creature — Phyrexian Rat

Card Text

Toxic 1 (Players dealt combat damage by this creature also get a poison counter.) Other Rats you control have toxic 1. When Karumonix enters, look at the top five cards of your library. You may reveal any number of Rat cards from among them and put the revealed cards into your hand. Put the rest on the bottom of your library in a random order.

Card Stats

3/3 rare CMC: 3.0 ONE ONE 🎨 Helge C. Balzer
Toxic

Market Prices

TCGPlayer
$0.58
Normal
Buy
TCGPlayer
$0.65
Foil
Buy
Card Kingdom
$0.59
Normal
Buy
Card Kingdom
$0.79
Foil
Buy
Cardmarket
€0.45
Normal
Buy
Cardmarket
€0.50
Foil
Buy
Prices updated: 2025-12-04

Format Legality

Brawl Legal
Commander Legal
Duel Legal
Gladiator Legal
Historic Legal
Legacy Legal
Modern Legal
Oathbreaker Legal
Penny Legal
Pioneer Legal
Timeless Legal
Vintage Legal

Similar Cards

Other Printings (6 total)

Community Stats

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Decks Using This Card
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Comments

Often Played With

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Frequently Asked Questions

What is Karumonix, the Rat King? Basics

Karumonix, the Rat King is a Legendary Creature — Phyrexian Rat card from the Magic: The Gathering trading card game.

Its ability reads: "Toxic 1 (Players dealt combat damage by this creature also get a poison counter.) Other Rats you control have toxic 1. When Karumonix enters, look at the top five cards of your library. You may reveal any number of Rat cards from among them and put the revealed cards into your hand. Put the rest on the bottom of your library in a random order."

How much mana does Karumonix, the Rat King cost to cast? Basics

Karumonix, the Rat King has a mana cost of {1}{B}{B}, which equals 3.0 total mana (converted mana cost/mana value).

It requires B mana to cast.

What does mana cost mean in Magic: The Gathering? Basics

Mana cost is the amount and type of mana required to cast a spell in Magic: The Gathering.

Karumonix, the Rat King's mana cost of {1}{B}{B} means you need to pay that much mana from your lands or other sources.

Colored symbols (W=White, U=Blue, B=Black, R=Red, G=Green) must be paid with that specific color, while numbers can be paid with any color.

What is converted mana cost (CMC) or mana value? Basics

Converted mana cost (now officially called "mana value") is the total amount of mana in a card's mana cost, regardless of color.

Karumonix, the Rat King has a mana value of 3.0. This is important for effects that care about a spell's total cost, like cascade or cards that say "mana value 3 or less."

What is oracle text? Basics

Oracle text is the official, current rules text for a Magic card as maintained by Wizards of the Coast. It supersedes any printed text on older cards.

Karumonix, the Rat King's current oracle text is: "Toxic 1 (Players dealt combat damage by this creature also get a poison counter.) Other Rats you control have toxic 1. When Karumonix enters, look at the top five cards of your library. You may reveal any number of Rat cards from among them and put the revealed cards into your hand. Put the rest on the bottom of your library in a random order."

What is the current price of Karumonix, the Rat King? Pricing

The current market price for Karumonix, the Rat King is approximately $0.58 USD on TCGPlayer.

A foil copy costs approximately $0.65 USD.

On Cardmarket (Europe), it's approximately €0.45 EUR.

Where can I buy Karumonix, the Rat King? Pricing

You can purchase Karumonix, the Rat King from major MTG retailers including:

Prices vary by condition and printing. Check multiple sellers to find the best price.

What is the difference between normal and foil cards? Pricing

Foil cards have a shiny, holographic finish that makes them more collectible. They are functionally identical to normal cards but typically cost more due to their rarity and visual appeal.

Karumonix, the Rat King normal: $0.58 | foil: $0.65

Is Karumonix, the Rat King legal in Standard? Legality

Format legality information for Karumonix, the Rat King in Standard is not available.

Standard is a rotating format that only allows cards from the most recent sets.

Is Karumonix, the Rat King legal in Modern? Legality

Karumonix, the Rat King is Legal in Modern format.

Modern includes all cards printed in a standard-legal set from 8th Edition forward.

Is Karumonix, the Rat King legal in Commander (EDH)? Legality

Karumonix, the Rat King is Legal in Commander (EDH) format.

Commander is a casual multiplayer format where you build a 100-card singleton deck around a legendary creature.

Is Karumonix, the Rat King legal in Pioneer? Legality

Karumonix, the Rat King is Legal in Pioneer format.

Pioneer is a non-rotating format that includes all standard-legal sets from Return to Ravnica forward.

Is Karumonix, the Rat King legal in Legacy? Legality

Karumonix, the Rat King is Legal in Legacy format.

Legacy allows almost all cards ever printed, with a substantial ban list for balance.

Is Karumonix, the Rat King legal in Vintage? Legality

Karumonix, the Rat King is Legal in Vintage format.

Vintage is the most permissive format, allowing almost all cards with only a minimal ban list. Some powerful cards are "Restricted" (limited to 1 copy).

Is Karumonix, the Rat King legal in Pauper? Legality

Format legality information for Karumonix, the Rat King in Pauper is not available.

Pauper only allows cards that have been printed at common rarity in a paper or online set.

What is format legality in MTG? Legality

Format legality indicates which official MTG formats allow a card to be played:

  • Legal: Card is allowed in the format
  • Banned: Card is prohibited from play
  • Restricted: Limited to 1 copy (Vintage only)
  • Not Legal: Card was never part of that format's card pool

Different formats have different banned lists based on power level and game balance.

What set is Karumonix, the Rat King from? Details

This printing of Karumonix, the Rat King is from ONE (ONE), with collector number 98.

Karumonix, the Rat King may also appear in other MTG sets with different art or special treatments.

What is Karumonix, the Rat King's rarity? Details

Karumonix, the Rat King is a rare card in ONE.

Card rarity affects both availability and price. From rarest to most common: Mythic Rare → Rare → Uncommon → Common.

Who illustrated Karumonix, the Rat King? Details

Karumonix, the Rat King was illustrated by Helge C. Balzer.

Magic: The Gathering features artwork from hundreds of talented artists, and many cards have been reprinted with new art over the years.

What is Karumonix, the Rat King's power and toughness? Details

Karumonix, the Rat King is a 3/3 creature.

Power (3) determines how much combat damage the creature deals. Toughness (3) determines how much damage it can take before being destroyed.

💬 Card Discussion

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