Sphinx's Decree 
Sorcery
Each opponent can't cast instant or sorcery spells during that player's next turn.
Legality
standardNOT LEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL
Sorcery
Each opponent can't cast instant or sorcery spells during that player's next turn.