43 cards where the card types include “artifact” and the text includes “ add ” and the mana value = 4

Black Mana Battery (Fourth Edition #298)
Blue Mana Battery (Fourth Edition #300)
Charmed Pendant (Odyssey #298)
Conqueror's Galleon // Conqueror's Foothold (Ixalan #234)
Conqueror's Galleon // Conqueror's Foothold (Ixalan #234)
Crossroads Candleguide (Innistrad: Midnight Hunt #253)
Crystalline Crawler (Commander Anthology Volume II #183)
Crystal Skull, Isu Spyglass (Assassin's Creed #15)
Diamond Kaleidoscope (Visions #143)
Empowered Autogenerator (Commander 2019 #54)
Firemind Vessel (Commander Masters #383)
Five Hundred Year Diary (Doctor Who #42)
Gemstone Array (Fifth Dawn #124)
Golden Guardian // Gold-Forge Garrison (Rivals of Ixalan #179)
Golden Guardian // Gold-Forge Garrison (Rivals of Ixalan #179)
Green Mana Battery (Fourth Edition #323)
Hedron Archive (Foundations #726)
Ice Cauldron (Masters Edition IV #206)
Ichor Elixir (March of the Machine Commander #46)
Key to the Archive (Alchemy: Innistrad #59)
Khalni Gem (Zendikar #205)
Kolvori, God of Kinship // The Ringhart Crest (Kaldheim #181)
Kolvori, God of Kinship // The Ringhart Crest (Kaldheim #181)
Krark-Clan Ironworks (Fifth Dawn #134)
Lavabrink Floodgates (Commander 2020 #53)
Machine God's Effigy (The Brothers' War Commander #16)
Nyx Lotus (Theros Beyond Death #235)
Paradise Plume (Commander 2021 #255)
Primal Amulet // Primal Wellspring (Ixalan #243)
Primal Amulet // Primal Wellspring (Ixalan #243)
Red Mana Battery (Fourth Edition #343)
Relic of Sauron (Tales of Middle-earth Commander #79)
Rose, Cutthroat Raider (Fallout #66)
Runecarved Obelisk (Alchemy: Outlaws of Thunder Junction #30)
Sarevok's Tome (Commander Legends: Battle for Baldur's Gate #685)
Sceptre of Eternal Glory (Warhammer 40,000 Commander #166)
Signpost Scarecrow (Jumpstart #485)
Sisay's Ring (Commander Legends #340)
Stonespeaker Crystal (Commander Legends: Battle for Baldur's Gate #338)
Su-Chi (Vintage Masters #285)
Tanuki Transplanter (Neon Dynasty Commander #30)
The Golden Throne (Warhammer 40,000 Commander #157)
Thousand Moons Smithy // Barracks of the Thousand (The Lost Caverns of Ixalan #39)
Thousand Moons Smithy // Barracks of the Thousand (The Lost Caverns of Ixalan #39)
Thran Dynamo (Commander Masters #415)
Ur-Golem's Eye (Commander 2014 #280)
Visage of Bolas (Hour of Devastation #208)
White Mana Battery (Fourth Edition #357)

In the blink of an eye, they strode from deep snow to the end of this search.