11 cards where the name includes “signet”

Arcane Signet (Outlaws of Thunder Junction Commander #252)
Azorius Signet (Ravnica: Clue Edition #219)
Boros Signet (Ravnica: Clue Edition #220)
Dimir Signet (Ravnica: Clue Edition #221)
Golgari Signet (Ravnica: Clue Edition #222)
Gruul Signet (Ravnica: Clue Edition #223)
Izzet Signet (Outlaws of Thunder Junction Commander #259)
Orzhov Signet (Outlaws of Thunder Junction Commander #261)
Rakdos Signet (Outlaws of Thunder Junction Commander #265)
Selesnya Signet (Ravnica: Clue Edition #227)
Simic Signet (Ravnica: Clue Edition #228)

The message was clear to Sorin—time to search for something else.