Karumonix, the Rat King

Strategy & Gameplay

Karumonix, the Rat King from ONE represents a powerful lord and tutor effect that makes this legendary creature an essential inclusion for any rat-focused strategy. As a three-mana black creature with a 3/3 body, Karumonix offers excellent rate for its power level, but its true strength lies in its ability to both pump your rat army and provide consistent card advantage through tutoring. The toxic 1 ability on both Karumonix itself and all your other rats gives your deck an alternative win condition beyond traditional damage, forcing opponents to manage poison counters while you establish board presence. This is particularly valuable in longer games where the twenty poison counters needed for a poison-based victory can become a realistic threat, especially when combined with other toxic sources in your deck. The enter-the-battlefield effect that lets you search your top five cards for any number of rats and put them directly into your hand creates explosive turns where you can rapidly assemble a synergistic team of creatures. This tutoring ability ensures consistency in rat decks, reducing mana flood and helping you find key pieces when you need them most. In Pioneer and Modern formats, Karumonix slots seamlessly into established rat decks alongside cards like Chatterfang, Squirrel General and Plague Rat, providing both a lord effect and tutoring engine that these decks desperately need. The card is legal across numerous formats including Commander and Brawl, where it serves as both a viable commander option and a powerful inclusion in the 99. For players building or upgrading rat-themed decks, Karumonix is a format-defining card that combines lord effects, card advantage, and poison synergies into one efficient package.