Thassa's Rebuff 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
Counter target spell unless its controller pays, where X is your devotion to blue. (Each
in the mana costs of permanents you control counts toward your devotion to blue.)
Complete guide
Thassa's Rebuff is a powerful blue instant that leverages the strength of your battlefield to shut down enemy spells. By scaling its cost with your devotion, it turns a board full of blue permanents into an impenetrable wall of countermagic.
Understanding Devotion
Thassa's Rebuff checks your devotion to blue at the moment the spell resolves. To calculate this value, count every blue mana symbol ({U}) appearing in the mana costs of all permanents you currently control on the battlefield. Note that mana symbols in text boxes or reminder text do not count; only those in the top right corner (or equivalent for special frames) of your permanents contribute to the total.
How the Resolution Works
When you cast Thassa's Rebuff, you choose a target spell. Upon resolution, the game calculates your current devotion to blue. This value becomes X. Your opponent is then given the choice to pay X mana. If they cannot or choose not to pay, their spell is countered and moved to the graveyard. If they pay the X mana, their spell remains on the stack and will eventually resolve as normal.
Common Mistakes
A frequent error is counting the mana symbols of Thassa's Rebuff itself toward the devotion total. Since Thassa's Rebuff is a spell on the stack and not a permanent on the battlefield, its own {U} symbol does not increase the value of X. Additionally, remember that if your permanents are removed in response to this spell, your devotion will be lower when the spell finally resolves, potentially allowing your opponent to pay the reduced cost.
When to Play It
This card shines in 'Mono-Blue Devotion' or heavy blue decks where you maintain a high count of blue permanents. While it is less reliable than a hard counter early in the game, it becomes an almost unavoidable 'Counterspell' as your board state grows, often forcing opponents to pay more mana than they have available.
Interaction examples
CounterspellImagine your opponent casts Counterspell targeting your creature. You respond with Thassa's Rebuff. If you control two blue permanents with a total of three {U} symbols in their costs, your devotion is 3. Your opponent must pay {3} or their Counterspell is countered. Unlike a standard Counterspell, Thassa's Rebuff relies on your board state rather than just having two blue mana available.
An Offer You Can't RefuseYour opponent casts a powerful artifact and you cast Thassa's Rebuff with a devotion of 2. Your opponent responds with An Offer You Can't Refuse to counter your Rebuff. If the Rebuff were to resolve, they would only need to pay {2}. If they have two Treasures, they can easily pay the tax. This illustrates that Thassa's Rebuff is vulnerable to opponents with high mana production or those who can counter your counter.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Thassa's Rebuff
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
Numeric 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.
- #2· 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.
- #3· 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.
- #4· 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.
Legal formats
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Meta decks with Thassa's Rebuff
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