45 cards where the cards aren’t reprints and the card is tagged “theft-artifact”

Hellkite Tyrant (Gatecrash #94)
Hostage Taker (Ixalan #223)
Thieving Skydiver (Zendikar Rising #85)
Treasure Nabber (Commander 2018 #27)
Beacon of Unrest (Fifth Dawn #41)
Captain N'ghathrod (Commander Legends: Battle for Baldur's Gate #646)
Thada Adel, Acquisitor (Worldwake #40)
Geth, Lord of the Vault (Scars of Mirrodin #64)
Dack Fayden (Conspiracy #42)
Souvenir Snatcher (Commander 2020 #38)
Scroll of Isildur (The Lord of the Rings: Tales of Middle-earth #69)
Memnarch (Darksteel #129)
Desertion (Visions #30)
Acquire (Fifth Dawn #21)
Hijack (Kaladesh #118)
Invoke the Winds (Kamigawa: Neon Dynasty #58)
Opportunistic Dragon (Throne of Eldraine #133)
Confusion in the Ranks (Mirrodin #87)
Wake the Dragon (Tales of Middle-earth Commander #74)
Master Thief (Magic 2012 #64)
Legerdemain (Tempest #72)
Eternal Dominion (Saviors of Kamigawa #36)
Confiscation Coup (Kaladesh #41)
Steal Artifact (Limited Edition Alpha #81)
Tezzeret, Master of Metal (Aether Revolt #190)
Sibling Rivalry (The Brothers' War #152)
Kukemssa Pirates (Mirage #71)
Magus of the Unseen (Ice Age #82)
Kefnet's Last Word (Hour of Devastation #39)
Aladdin (Arabian Nights #34)
Shrewd Negotiation (Kaladesh #64)
Shifting Grift (Outlaws of Thunder Junction #66)
Juxtapose (Legends #63)
Metallic Mastery (Mirrodin Besieged #71)
Gauntlets of Chaos (Legends #278)
Thought Dissector (Darksteel #152)
Scrounge (Darksteel #53)
Scarwood Bandits (The Dark #85)
Domineer (Mirrodin #33)
Arteeoh, Dread Scavenger (2021 Heroes of the Realm #2)
Dragon (Tales of Middle-earth Commander Tokens #14)
Power Struggle (Astral Cards #7)
TARDIS Bay (Doctor Who #601)
Timmerian Fiends (Homelands #58)
Wyll, Pact-Bound Duelist (Alchemy Horizons: Baldur's Gate #15)

Though this query has ended, its relics still slumber in New Argive.