55 cards where the card types include “equipment” and the color identity ≤ RU and it’s legal in Future Standard

Acquisition Octopus (Kamigawa: Neon Dynasty #44)
Aeronaut's Wings (The Brothers' War #231)
Arc Spitter (Streets of New Capenna #233)
Armguard Familiar (Kamigawa: Neon Dynasty #46)
Barbed Batterfist (Phyrexia: All Will Be One #121)
Beamtown Beatstick (March of the Machine #131)
Bespoke Battlegarb (Wilds of Eldraine #122)
Blade of Shared Souls (Phyrexia: All Will Be One #42)
Brass Knuckles (Commander Masters #372)
Bronze Cudgels (Kamigawa: Neon Dynasty #240)
Bronzeplate Boar (Kamigawa: Neon Dynasty #135)
Candlestick (Murders at Karlov Manor #43)
Cement Shoes (Streets of New Capenna #235)
Ceremonial Knife (Innistrad: Crimson Vow #254)
Concealed Weapon (Murders at Karlov Manor #117)
Cryptic Coat (Murders at Karlov Manor #50)
Diamond Pick-Axe (The Lost Caverns of Ixalan #143)
Dire Flail // Dire Blunderbuss (The Lost Caverns of Ixalan #145)
Dire Flail // Dire Blunderbuss (The Lost Caverns of Ixalan #145)
Dragonwing Glider (Phyrexia: All Will Be One #128)
Eater of Virtue (Kamigawa: Neon Dynasty #245)
Gilded Pinions (Streets of New Capenna #238)
Gold Pan (Outlaws of Thunder Junction #242)
Hero's Heirloom (Dominaria United #231)
Hexgold Halberd (Phyrexia: All Will Be One #136)
Hunter's Blowgun (The Lost Caverns of Ixalan #255)
Idol of the Deep King // Sovereign's Macuahuitl (The Lost Caverns of Ixalan #155)
Idol of the Deep King // Sovereign's Macuahuitl (The Lost Caverns of Ixalan #155)
Jackhammer (Streets of New Capenna #111)
Kitesail (March of the Machine #261)
Knife (Murders at Karlov Manor #134)
Lavaspur Boots (Outlaws of Thunder Junction #243)
Lizard Blades (Kamigawa: Neon Dynasty #153)
Lost Jitte (The Big Score #23)
Lotus Ring (The Big Score #24)
Luxior, Giada's Gift (Streets of New Capenna #240)
Mirran Banesplitter (March of the Machine #154)
Ninja's Kunai (Kamigawa: Neon Dynasty #252)
Ogre-Head Helm (Kamigawa: Neon Dynasty #155)
Pirate Hat (The Lost Caverns of Ixalan #70)
Prosthetic Injector (Phyrexia: All Will Be One #239)
Quick-Draw Dagger (Streets of New Capenna #243)
Rabbit Battery (Kamigawa: Neon Dynasty #157)
Ramosian Greatsword (March of the Machine #159)
Simian Sling (Kamigawa: Neon Dynasty #163)
Sunfire Torch (The Lost Caverns of Ixalan #167)
Swashbuckler's Whip (The Lost Caverns of Ixalan #263)
Sword of Forge and Frontier (Phyrexia: All Will Be One #244)
Sword of Once and Future (March of the Machine #265)
Sword of Wealth and Power (The Big Score #26)
Tarrian's Soulcleaver (The Lost Caverns of Ixalan #264)
The Key to the Vault (Outlaws of Thunder Junction #54)
The Reality Chip (Kamigawa: Neon Dynasty #74)
Thinking Cap (Murders at Karlov Manor #257)
Thran Power Suit (The Brothers' War #253)
Vanquisher's Axe (Dominaria United #240)
Vulshok Splitter (Phyrexia: All Will Be One #156)

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