Karumonix, the Rat King
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 Karumonix decks play in EDH
Karumonix, the Rat King is a mono-black commander costing 1BB, and its legendary creature - phyrexian rat line shapes the whole deck around it. Its ability is narrow enough that the deck is usually built to protect it and repeat the effect, rather than to go wide. The cards below are the ones Karumonix, the Rat King decks actually play most often, grouped by the job they do.
Most-played cards
20 cards · about $76.78Play rates from EDHREC. Prices from Scryfall, refreshed daily.
Ramp (1)
Card draw (2)
Removal (2)
Creatures (13)
Synergy & payoffs (1)
Lands (1)
Build the full 100
Grimoire generates a complete, Commander-legal Karumonix, the Rat King decklist with a written strategy, a full mana base and live prices — from the whole card pool, or only from cards you already own.
Start with KarumonixKarumonix deck questions
What colours can I use in a Karumonix, the Rat King deck?
Karumonix, the Rat King has a mono-black colour identity, so every card in the deck must be black or colourless. That includes mana symbols in rules text, not just casting cost.
What are the best cards for Karumonix, the Rat King?
The cards played most often in Karumonix, the Rat King decks include Rank Rat, Orcrist, Goblin-cleaver, Hall of Echoes. The full list of staples above is grouped by the job each card does, so you can see the deck's skeleton rather than just a pile of names.
How much does a Karumonix, the Rat King deck cost?
The 20 most-played cards shown above come to roughly $76.78 at current market prices. A complete 100-card build costs more, and Grimoire can generate a budget version instead if you set a price ceiling.
Can I build a Karumonix, the Rat King deck from cards I already own?
Yes. Import your collection into Grimoire and choose "my cards" when you build. The generator will only use cards you actually own, and the Missing Cards page shows what you would need to buy to finish any list.