11 cards where the name includes “signet”

Arcane Signet (Duskmourn: House of Horror Commander #92)
Azorius Signet (Duskmourn: House of Horror Commander #240)
Boros Signet (Ravnica: Clue Edition #220)
Dimir Signet (Ravnica: Clue Edition #221)
Golgari Signet (Duskmourn: House of Horror Commander #246)
Gruul Signet (Ravnica: Clue Edition #223)
Izzet Signet (Outlaws of Thunder Junction Commander #259)
Orzhov Signet (Duskmourn: House of Horror Commander #249)
Rakdos Signet (Duskmourn: House of Horror Commander #250)
Selesnya Signet (Ravnica: Clue Edition #227)
Simic Signet (Duskmourn: House of Horror Commander #252)

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