I Bask in Your Silent Awe

(An ongoing scheme remains face up until it's abandoned.) Each opponent can't cast more than one spell each turn. At the beginning of your upkeep, if no opponent cast a spell since your last turn ended, abandon this scheme.

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6om7tig677pb1hncxx7z50.