7 cards where the text includes “decree” and (the card is available on Paper)

Decree of Annihilation (Scourge #85)
Decree of Justice (Commander 2020 #85)
Decree of Pain (Commander Masters #148)
Decree of Savagery (Forgotten Realms Commander #156)
Decree of Silence (Scourge #32)
Marchesa's Decree (Conspiracy: Take the Crown #44)
Royal Decree (Alliances #14)

The arc of my blade has carved a path of light to the end of these results.