Carrion Feeder 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

This creature can't block. Sacrifice a creature: Put a +1/+1 counter on this creature.

Complete guide

Carrion Feeder is a classic staple for graveyard-focused decks, offering a zero-mana way to manage your board state. While it cannot stand on defense, its ability to grow larger by consuming your own creatures makes it a terrifying threat on the offense.

Endless Hunger

The most important thing to know about Carrion Feeder is that its sacrifice ability is a cost, denoted by the text before the colon. This means you can activate it any time you have priority, even in response to removal spells. Because it costs zero mana, you can sacrifice as many creatures as you control in a single turn to rapidly increase its power and toughness.

Step-by-Step Resolution

First, you announce the activation of the ability. Second, you choose a creature you control to sacrifice and move it to the graveyard; this is the cost and cannot be countered. Third, the ability goes on the stack. Once both players pass priority, the ability resolves and Carrion Feeder receives a +1/+1 counter. You can repeat this process as long as you have creatures to feed to it.

Common Pitfalls

Players often forget that Carrion Feeder cannot block. Even if it grows to a massive 10/10, it cannot be used to stop incoming attackers. Additionally, if an opponent tries to destroy Carrion Feeder, you can sacrifice other creatures in response to make it grow, but if Carrion Feeder itself is the target of a spell like Murder, the ability to sacrifice itself won't save it from leaving the battlefield unless you have another way to protect it.

Strategic Timing

The best time to use Carrion Feeder's ability is often in response to your opponent's spells. If they try to use a removal spell on your other creatures, you can sacrifice those creatures to the Feeder instead. This ensures you get a permanent benefit (a +1/+1 counter) rather than losing the creature for nothing.

Interaction examples

The Artist's Muse

Blood Artist

With both on the battlefield, you sacrifice a creature to Carrion Feeder. The sacrifice triggers Blood Artist's ability. You choose a target player to lose 1 life and you gain 1 life. Then, Carrion Feeder gets a +1/+1 counter. This creates a two-point life swing every time the Feeder eats.

Feeding the Thopter

Ornithopter of Paradise

If your opponent casts a spell to destroy your Ornithopter of Paradise, you can respond by sacrificing the Ornithopter to Carrion Feeder. The Ornithopter goes to the graveyard before the opponent's spell resolves, and Carrion Feeder gets a +1/+1 counter, effectively 'recycling' your dying artifact into permanent stats.

A Lone Feeder

Even without other cards, Carrion Feeder can sacrifice itself. If it is targeted by an effect that would exile it, you can pay the cost by sacrificing Carrion Feeder to its own ability. While it won't get the counter because it is no longer on the battlefield, you successfully moved it to the graveyard, which can be useful for later graveyard recursion.

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