Plague Rats is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.
Official card text
Plague Rats's power and toughness are each equal to the number of creatures named Plague Rats on the battlefield.
Complete guide
Plague Rats is a classic Magic: The Gathering card that embodies the strength of the swarm. As you gather more of these rodents, their power and toughness grow exponentially, turning a small nuisance into a lethal infestation. This guide explores how their ability scales and how they interact with modern card types.
Variable Power and Toughness
Plague Rats features a characteristic-defining ability that sets its power and toughness. Unlike triggered abilities that use the stack, this ability is always active in all zones, including the library and graveyard. It counts every creature on the battlefield that has the exact name 'Plague Rats', regardless of who controls them.
Resolution Step-by-Step
When a Plague Rats enters the battlefield, the game continuously checks the number of permanents with that name. If you control one, it is a 1/1. When a second one enters, both immediately become 2/2s. This change is instantaneous and does not use the stack, meaning there is no window for an opponent to kill a 1/1 before it becomes a 2/2 if the second one has already resolved.
Common Pitfalls
A frequent mistake is assuming Plague Rats counts all creatures with the 'Rat' subtype. It only counts creatures specifically named 'Plague Rats'. Additionally, while its power and toughness are defined in all zones, the ability only checks the battlefield for the count. If a card refers to its power while in your hand, it will still equal the number of Plague Rats currently on the battlefield.
When to Play It
Plague Rats is most effective in decks that can quickly deploy multiple copies or use cloning effects. Since its stats depend on the board state, it is vulnerable to board wipes which can reduce the entire swarm's stats simultaneously. Timing your deployments to survive mass removal is key to maintaining their pressure.
Interaction examples
Solemn SimulacrumIf you control one Plague Rats and then cast Solemn Simulacrum, the Plague Rats remains a 1/1. Even though Solemn Simulacrum is a creature, it does not share the name 'Plague Rats'. You search for a land as normal, but your Rat's stats do not change because the ability only checks for that specific name.
Roaming ThroneIf you cast Roaming Throne and choose 'Rat', the Throne becomes a Rat in addition to its other types. However, Plague Rats specifically checks for the name 'Plague Rats', not the creature type. Therefore, even though Roaming Throne is now a Rat, it does not increase the power or toughness of your Plague Rats because its name remains 'Roaming Throne'.
If you control two Plague Rats and your opponent controls one Plague Rats, every single one of them on the battlefield will be a 3/3. The ability does not specify 'creatures you control', so it counts every creature with that name across the entire board.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Plague Rats
Original English text — Wizards of the Coast / Scryfall
No additional ruling has been published for this card.
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Meta decks with Plague Rats
No archived Top 8 deck with this card yet.