Blight-Breath Catoblepas 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
When this creature enters, target creature an opponent controls gets -X/-X until end of turn, where X is your devotion to black. (Eachin the mana costs of permanents you control counts toward your devotion to black.)
Complete guide
Blight-Breath Catoblepas is a formidable Beast that turns your board presence into a potent debuff. By harnessing your devotion to black, this creature can often take down the largest threats on the battlefield simply by entering the game.
What It Does
Blight-Breath Catoblepas has an 'enters-the-battlefield' triggered ability that targets one creature an opponent controls. The target gets -X/-X until the end of the turn, where X is the number of black mana symbols in the mana costs of all permanents you control. This includes the {B}{B} in the Catoblepas's own cost, assuming it is still on the battlefield when the ability resolves.
Resolving the Ability Step-by-Step
First, the Catoblepas enters the battlefield, putting its ability on the stack. You must choose a target creature an opponent controls at this time. Second, players have a chance to respond with spells or abilities. Third, as the ability resolves, the game checks your current devotion to black by counting the mana symbols on your permanents. Finally, the target creature receives the -X/-X penalty based on that count. Note that once the ability resolves, the penalty is locked in; it won't change even if your devotion changes later in the turn.
Common Mistakes to Avoid
A frequent error is counting mana symbols in the text box of a card. Devotion only looks at the mana cost in the upper right corner of your permanents. For example, generic mana symbols like {1} or {4} do not count toward devotion. Additionally, if the Catoblepas is destroyed in response to its own ability, it won't be on the battlefield to contribute its two {B} symbols to the final count of X.
When to Play It
This creature is most effective in a 'Mono-Black' shell where you have many permanents with multiple black mana symbols. Because it provides a -X/-X effect, it can bypass keyword abilities like Indestructible, making it an excellent answer to gods or shielded threats that damage-based removal cannot touch.
Interaction examples
Syr Konrad, the GrimIf you control Syr Konrad, the Grim ({3}{B}{B}) and cast Blight-Breath Catoblepas ({4}{B}{B}), when the Catoblepas enters, its ability checks your devotion. You have two black symbols from Konrad and two from the Catoblepas. The target creature will get -4/-4.
Gray Merchant of AsphodelWith Gray Merchant of Asphodel already on the board, your devotion is at least two. When Blight-Breath Catoblepas joins the fray, your total devotion to black becomes four. This ensures the Catoblepas can shrink a target by -4/-4, likely clearing the way for an attack.
If you play Blight-Breath Catoblepas while you have no other black permanents, its ability goes on the stack. If an opponent destroys the Catoblepas in response, when the ability finally resolves, your devotion to black is 0. The target creature gets -0/-0 and survives.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Blight-Breath Catoblepas
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
The value of X is determined only as the triggered ability resolves. Once that happens, the value of X won’t change later in the turn even if your devotion to black changes.
No other card is named in this ruling.
- #2· Wizards of the Coast
Colorless and generic mana symbols (
, 
, 
, 
, 
, and so on) in mana costs of permanents you control don’t count toward your devotion to any color.No other card is named in this ruling.
- #3· Wizards of the Coast
Mana symbols in the text boxes of permanents you control don’t count toward your devotion to any color.
No other card is named in this ruling.
- #4· Wizards of the Coast
Hybrid mana symbols, monocolored hybrid mana symbols, and Phyrexian mana symbols do count toward your devotion to their color(s).
No other card is named in this ruling.
- #5· Wizards of the Coast
If an activated ability or triggered ability has an effect that depends on your devotion to a color, you count the number of mana symbols of that color among the mana costs of permanents you control as the ability resolves. The permanent with that ability will be counted if it’s still on the battlefield at that time.
No other card is named in this ruling.
- #6· Wizards of the Coast
If you put an Aura on an opponent’s permanent, you still control the Aura, and mana symbols in its mana cost count towards your devotion.
No other card is named in this ruling.
Legal formats
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Meta decks with Blight-Breath Catoblepas
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