Marrow-Gnawer — ruling 1

Marrow-Gnawer's ability counts the number of Rats on the battlefield when it resolves, so you don't count the sacrificed Rat.

Marrow-Gnawer : règles, fonctionnement et interactions (MTG)

Marrow-Gnawer 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

All Rats have fear. , Sacrifice a Rat: Create X 1/1 black Rat creature tokens, where X is the number of Rats you control.

Complete guide

Marrow-Gnawer is the ultimate commander for any Rat tribal deck, providing both evasion and explosive token generation. By granting Fear to all your rodents and turning single Rats into entire swarms, it quickly overwhelms opponents who aren't prepared for the plague. This legendary Rat Rogue turns your board state into an exponential growth engine.

Rat Evasion and Sacrifice

Marrow-Gnawer has two primary functions: a static ability and an activated ability. The static ability gives all Rats 'Fear,' meaning they cannot be blocked except by artifact creatures and/or black creatures. The activated ability requires you to tap Marrow-Gnawer and sacrifice a Rat as a cost. In return, you create a number of 1/1 black Rat creature tokens equal to the number of Rats you currently control.

Step-by-Step Resolution

When you activate the ability, you must first pay the costs: tap Marrow-Gnawer and sacrifice one Rat (this can be Marrow-Gnawer itself or any other Rat you control). Once the ability is on the stack and players have passed priority, the ability resolves. At this moment, the game checks how many Rats you currently have on the battlefield. You then create that many 1/1 black Rat creature tokens.

Timing and Counting

A common mistake is counting the sacrificed Rat toward the final token count. Because the sacrifice happens as a cost, that Rat is already in the graveyard before the ability resolves. The game only looks at the Rat count during resolution. However, if you have other effects that care about Rats entering the battlefield, they will trigger for every new token created by this ability.

Strategic Deployment

To maximize Marrow-Gnawer, wait until the end of an opponent's turn to activate the ability. This ensures your new Rat tokens are no longer affected by summoning sickness when your turn starts, allowing them to attack immediately with Fear. Since Marrow-Gnawer is a Rat itself, it benefits from its own Fear keyword, making it a dangerous attacker.

Interaction examples

Basic Token Generation

Rat

You control Marrow-Gnawer and three Rat tokens. You activate Marrow-Gnawer, sacrificing one Rat token. When the ability resolves, you control Marrow-Gnawer and two Rat tokens (total of 3 Rats). You create three new Rat tokens, bringing your total to six Rats.

Blocking with Fear

Solemn Simulacrum

You attack with Marrow-Gnawer. Your opponent controls Solemn Simulacrum. Because Marrow-Gnawer gives all Rats Fear, it can only be blocked by black or artifact creatures. Since Solemn Simulacrum is an artifact creature, it is eligible to block Marrow-Gnawer.

Static Buffs and Type Interactions

Roaming Throne

If you have Roaming Throne on the battlefield with 'Rat' chosen as the type, it will gain Fear from Marrow-Gnawer's static ability. Note that Roaming Throne's doubling effect only applies to triggered abilities; since Marrow-Gnawer's token creation is an activated ability (indicated by the colon), Roaming Throne will not cause it to activate twice.

Guide written with AI from the official text and rulings. Official English text prevails.

How it works : Marrow-Gnawer

Original English text — Wizards of the Coast / Scryfall

#1December 1, 2004· Wizards of the Coast
Marrow-Gnawer's ability counts the number of Rats on the battlefield when it resolves, so you don't count the sacrificed Rat.
Card named in this ruling
Rat