Curtains' Call 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
Undaunted (This spell costsless to cast for each opponent.) Destroy two target creatures.
Complete guide
Curtains' Call is a powerful black instant designed specifically for the chaos of multiplayer games. It allows you to eliminate two threats simultaneously at a significant discount thanks to its unique keyword. This spell proves that in a crowded arena, the price of removal drops as the number of enemies rises.
Understanding Undaunted
The Undaunted keyword is a cost-reduction mechanic that counts the number of opponents you have at the moment you announce the spell. For each opponent currently in the game, the total cost of Curtains' Call is reduced by one generic mana. In a typical four-player Commander game, this means you can destroy two creatures for as little as three mana. It is important to note that once you announce the spell and lock in the cost, players leaving the game will not force you to pay more.
Targeting Requirements
To cast Curtains' Call, you must be able to choose two distinct target creatures. You cannot target the same creature twice to ensure it dies, nor can you cast it if there is only one creature on the battlefield. If one of the two targets becomes illegal before the spell resolves (for example, it gains Hexproof or is sacrificed), the spell will still resolve and destroy the remaining legal target.
Mana Value and Cost Reduction
While Undaunted reduces the amount of mana you physically spend, it does not change the spell's mana value (formerly known as converted mana cost). Curtains' Call always has a mana value of 6. This distinction is vital when interacting with cards that check the printed cost of a spell rather than what was paid for it.
Interaction examples
If you reveal Curtains' Call while resolving Ad Nauseam, you will lose 6 life. Even if you have three opponents and could cast Curtains' Call for only three mana, Ad Nauseam looks at the mana value printed on the card, which remains 6 regardless of any cost-reducing effects.
Suppose an opponent casts Curtains' Call targeting your 7/7 creature and another player's creature. You can respond with Not of This World. Because Curtains' Call is a spell targeting a creature you control with power 7 or greater, the cost of Not of This World is reduced by 7, allowing you to counter the removal spell for zero mana.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Curtains' Call
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
You can't cast Curtains' Call without two creatures to target. If one becomes an illegal target after you've cast Curtains' Call, the other will still be destroyed.
No other card is named in this ruling.
- #2· Wizards of the Coast
Causing an opponent to lose the game after you've announced that you're casting a spell with undaunted and determined its total cost won't cause you to have to pay more mana.
No other card is named in this ruling.
- #3· Wizards of the Coast
Effects that reduce what you pay to cast a spell don't affect its mana value.
No other card is named in this ruling.
Legal formats
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Meta decks with Curtains' Call
No archived Top 8 deck with this card yet.



Ad Nauseam
Not of This World