Karumonix, the Rat King

Legendary Creature — Phyrexian Rat{1}{B}{B}3/3

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.

Colour identity Black · Toxic · Commander page

In short

Karumonix, the Rat King has 6 listed printings; the most valuable is the Showcase · Step-and-Compleat Foil printing from ONE at US$14.37 on TCGplayer's market price. Prices below are the cheapest in-stock listing in the United States.