Your search for "Sphinx's Decree 24" revealed the following:
Sphinx's Decree (Foil) (RIX) from Rivals of Ixalan, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Daarken Card Text:Each opponent can't cast instant or sorcery spells during that player's next turn.
Sphinx's Decree (RIX) from Rivals of Ixalan, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Daarken Card Text:Each opponent can't cast instant or sorcery spells during that player's next turn.
Sphinx's Decree - Prerelease Promo (Foil) (PRIX) from Rivals of Ixalan, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Daarken Card Text:Each opponent can't cast instant or sorcery spells during that player's next turn.