Sphinx's Decree
Tracked across real Commander games played through TurnZero HQ.
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What it does
Each opponent can't cast instant or sorcery spells during that player's next turn.
Rulings
One official ruling, as Wizards published it.
- 2018-01-19
If multiple effects say that an opponent can’t cast instant or sorcery spells during that player’s next turn, they all apply to the same turn.
Rulings are Wizards of the Coast's own, mirrored from Scryfall and refreshed nightly.
In the 99
Every deck whose current list includes Sphinx's Decree, whatever its commander.
Every version of Sphinx's Decree
2 printings, newest first. Prices are the market figures Scryfall publishes, refreshed nightly. A printing with no figure shows a dash rather than a zero, because Scryfall publishes none for some of them.

Rivals of Ixalan
- Normal
- $0.38
- Foil
- $0.29

Promo
Rivals of Ixalan Promos
- Foil
- $0.83
Prices from Scryfall, which tracks the TCGplayer and Cardmarket markets. They move daily and are a guide rather than a quote. Search TCGplayer for Sphinx's Decree. It runs a name search across every version, which covers the printings TCGplayer publishes no direct link to.
Aggregated from Commander games tracked in TurnZero HQ. Every figure counts decks and games only. No individual deck list, player or playgroup is identified. Win rates are withheld below 5 completed games, where the sample is too small to mean anything.