19 cards where the text includes “don't own”

Agent of Treachery (Core Set 2020 #43)
Arvinox, the Mind Flail (Universes Within #1)
Blim, Comedic Genius (Commander Legends #272)
Don Andres, the Renegade (The Lost Caverns of Ixalan Commander #6)
Gonti, Canny Acquisitor (Outlaws of Thunder Junction Commander #1)
Grenzo, Crooked Jailer (Alchemy: Outlaws of Thunder Junction #22)
Herald of Leshrac (Coldsnap #62)
Ian Malcolm, Chaotician (Jurassic World Collection #13)
Impetuous Lootmonger (Alchemy: Outlaws of Thunder Junction #12)
Laughing Jasper Flint (Outlaws of Thunder Junction #215)
Sentinel of Lost Lore (Wilds of Eldraine #184)
Staff of Eden, Vault's Key (Assassin's Creed #76)
Tasha, the Witch Queen (Commander Legends: Battle for Baldur's Gate #294)
The Horus Heresy (Warhammer 40,000 Commander #126)
Thieving Amalgam (Outlaws of Thunder Junction Commander #150)
Thieving Aven (Alchemy: Outlaws of Thunder Junction #8)
Thieving Varmint (Outlaws of Thunder Junction Commander #23)
Triumphant Getaway (Alchemy: Outlaws of Thunder Junction #27)
Weave the Nightmare (Alchemy: Outlaws of Thunder Junction #29)

This search is finished. Now the real work can begin.