Karumonix, the Rat King
ONEPhyrexia: All Will Be One/#98/2023Rare
Colour IDMV 3
Current paper retail
Card Kingdom$1.49
Cardmarket€0.57
TCGplayer$0.88
ManaPool$0.22
Buylist (dealers pay)
Card Kingdom$0.30
MTGO (Cardhoarder)
retail$0.02 tix
Paper retail history (USD)
3 providers
Latest $1.49High $1.79Low $0.99▲ 50.5%
Market and collecting
Market overview
$0.88TCGplayer, USD, retail, nonfoil
Latest observation: 2026-11-10
7d▲ 3.5%30d▼ 10.2%90d▼ 29.6%
90d high
$1.50
90d low
$0.81
Paper printings priced
6
Currently 2nd
Cheapest paper printing
$0.68
Phyrexia: All Will Be One
- Down 10.2% over the last 30 days on TCGplayer.
- Currently 41% below its 90 day high of $1.50.
- This printing is the 2nd cheapest paper printing currently priced (6 priced in total).
- Foil copies of this printing carry a 27% premium over nonfoil.
Find this printing on eBayView on TCGplayerAffiliate. MTGPrices may earn from qualifying eBay and TCGplayer purchases.
Collect
Play
Compare printings (6 priced)
Gameplay and rules
Legendary Creature — Phyrexian Rat
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.
3 / 3
Keywords
Toxic
Card capabilities
CreatureLegendary creature
Derived deterministically from card types, Oracle text and keywords. Not a strategic evaluation.
Format legality
Primary formats
Eternal formats
Rulings (7)
wotc4 Feb 2023
Multiple instances of toxic are cumulative. For example, if a creature has toxic 2 and gains toxic 1 due to another effect, combat damage that creature deals to a player will cause that player to get 3 poison counters.
wotc4 Feb 2023
Any other effects of that damage, such as life gain from lifelink, still apply.
wotc4 Feb 2023
Conversely, replacement effects that apply to the number of counters put on a player can modify the counters placed this way. For example, Vorinclex, Monstrous Raider's last two abilities can apply to counters placed this way.
wotc4 Feb 2023
Damage dealt by a creature with toxic grants the same number of counters regardless of how much damage is dealt. Notably, if a replacement effect modifies the damage in some way (such as that of Gratuitous Violence), the number of counters given remains unchanged.
wotc4 Feb 2023
Toxic doesn't change the amount of combat damage a creature deals. For example, if a 2/2 creature with toxic 1 deals combat damage to a player, that creature will deal 2 damage. The results of that damage are the player loses 2 life and gets a poison counter.
wotc4 Feb 2023
A player with ten or more poison counters loses the game. This is a state-based action and doesn't use the stack. In other words, it happens immediately and players can't respond to it, just like a player losing the game due to having 0 or less life.
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About this card
Karumonix, the Rat King
Karumonix, the Rat King is a Legendary Creature — Phyrexian Rat, with mana cost {1}{B}{B} (mana value 3). Printed 6 times across MTG sets.
Format legality: Commander: legal, Modern: legal, Standard: not_legal, Pioneer: legal, Legacy: legal, Pauper: not_legal.
Current headline price on TCGplayer: $0.88 (down 10.2% over 30 days).
Frequently asked
Karumonix, the Rat King FAQ
How much is Karumonix, the Rat King worth?
The current TCGplayer USD retail price for Karumonix, the Rat King is $0.88. It is down 10.2% over the last 30 days. Over 90 days it has ranged from $0.81 to $1.50.
What is the cheapest printing of Karumonix, the Rat King?
The cheapest currently priced paper printing is from Phyrexia: All Will Be One at $0.68 on TCGplayer.
What is the most expensive printing of Karumonix, the Rat King?
The most expensive currently priced paper printing is from Phyrexia: All Will Be One at $12.79 on TCGplayer.
How many printings of Karumonix, the Rat King are there?
Karumonix, the Rat King has been printed 6 times in English paper sets that MTGPrices tracks.
What set was Karumonix, the Rat King first printed in?
The earliest English paper printing that MTGPrices tracks is from ONE #98, released 2023-02-10.
Is there a foil version of Karumonix, the Rat King?
Yes. On this printing, foil copies trade at $1.12 versus $0.88 for nonfoil, which is 27% more expensive on TCGplayer.
Is Karumonix, the Rat King legal in Commander?
Yes, Karumonix, the Rat King is currently legal in Commander per Scryfall's legality feed.
Is Karumonix, the Rat King legal in Modern?
Yes, Karumonix, the Rat King is currently legal in Modern per Scryfall's legality feed.