Rat

Rats are small, omnivorous rodents belonging to the genus Rattus. These common and prolific creatures can be found in many planes, and are often plague - and disease carriers (Pestilence Rats, Diseased Vermin). Rats often appear in large numbers.

Description
The first card to bear the creature type Rat was Plague Rats in Alpha. All Rats are black, sometimes with red as second color. They are primarily associated with two types of effects:
 * Determining their own power and/or toughness based on the number of rats in play: Swarm of Rats, Plague Rats, Pestilence Rats, Pack Rat, Relentless Rats</c>, ...
 * One-shot discard effects, especially as enter-the-battlefield (after the original Ravenous Rats</c>) or death triggers: Drainpipe Vermin</c>, Hellhole Rats</c>, Rotting Rats</c>, Chittering Rats</c>, Sanity Gnawers</c>, ...

Dominaria
Wharf Rats were found in port cities and other places in Golthonor, like Balthesa. They were responsible for the death of Xarl’s sister Init. Other Rats hide in Bog Rats</c>, Sewer Rats</c> or Crypt Rats</c>. On Otaria they were known to prey on graves.

Nezumi
Nezumi are a race of anthropomorphic rats native to Kamigawa. They live in the bogs of the Takenuma swamp and on the outskirts of human cities like Numai, sometimes raiding those cities for supplies or fun. They often have the ninja class. Some Nezumi shamans use incantations to summon and control insects to swarm and distract their enemies.

Rath
The dungeons of Volrath were infested with Rabid Rats</c>. The Oracle en-Vec used the Rats of Rath</c> in the scrutiny of entrails.

Ravnica
The sewers of the Undercity of Ravnica are infested by rabid Sewer Sirens. They mesmerize their victims, urging them to pet their furry snout. They don't attack unless a hand is put in their mouth.

Notable Rats
Kamigawa
 * Black-Nose, ninja
 * Ink-Eyes, a female ninja, serving the dark forces on Kamigawa.
 * Marrow-Gnawer, a gang leader
 * Nighteyes the Desecrator</c>, an infamous necromancer.
 * Nashi, Tamiyo's adopted son.

Trivia

 * Dirty Wererat</c> is a Human Rat.
 * Rotting Rats</c> and Gutter Skulk</c> are Zombie Rats.
 * Gobhobbler Rats</c>, Hellhole Rats</c> and Sanity Gnawers</c> are the only multicolored Rats.
 * <c>Swarmyard</c> is a land that regenerates rats.