58 cards where the card types include “artifact creature” and the color identity ≤ U and the mana value <= 1

Hangarback Walker (Commander Masters #951)
Memnite (Duel Decks: Mirrodin Pure vs. New Phyrexia #2)
Ornithopter (Dominaria Remastered #233)
Phyrexian Marauder (Visions #151)
Phyrexian Walker (Visions #152)
Robo- (Unstable #157)
Shield Sphere (Masters Edition #166)
Shifting Wall (Stronghold #140)
Steam-Powered (Unstable #161)
Stonecoil Serpent (Commander Masters #976)
Walking Ballista (Double Masters #306)
Arcbound Worker (Modern Masters #201)
Blurry Beeble (Unstable #27)
Bonded Construct (Magic Origins #223)
Brass Gnat (Time Spiral #249)
Brass Man (Masters Edition IV #185)
Chronomaton (Duel Decks: Jace vs. Vraska #2)
Clockwork Beetle (Mirrodin #153)
Cogmentor (Unstable #143)
Cogwork Wrestler (The Lost Caverns of Ixalan #49)
Combat Courier (The Brothers' War #77)
Drillworks Mole (Commander Legends: Battle for Baldur's Gate #311)
Excavated Wall (Strixhaven: School of Mages #255)
Gingerbrute (Wilds of Eldraine #246)
Heap Doll (Ultimate Masters #228)
Hope of Ghirapur (Aether Revolt #154)
Icehide Golem (Modern Horizons #224)
Inquisitive Puppet (Throne of Eldraine #223)
Iron Apprentice (Kamigawa: Neon Dynasty #248)
Jawbone Skulkin (Eventide #170)
K-9, Mark I (Doctor Who #47)
Keeper of the Lens (Dragons of Tarkir #240)
Lightning-Core Excavator (Jumpstart #32)
Locthwain Gargoyle (Throne of Eldraine #225)
Merchant's Dockhand (Aether Revolt #163)
Metallic Sliver (Tempest Remastered #226)
Myr Mindservant (Mirrodin #213)
Myr Moonvessel (Darksteel #133)
Myr Scrapling (Modern Horizons 2 #230)
Myr Servitor (Ultimate Masters #230)
Network Disruptor (Kamigawa: Neon Dynasty #71)
Phyrexian Dreadnought (Mirage #315)
Razorgrass Screen (Fifth Dawn #145)
Roterothopter (Masters Edition II #218)
Secret Door (Adventures in the Forgotten Realms #71)
Signal Pest (Mirrodin Besieged #131)
Silver Raven (Adventures in the Forgotten Realms #74)
Socketed Sprocketer (Unstable #44)
Soldevi Sentry (Alliances #132a)
Sparring Construct (Dominaria #232)
Spectrum Sentinel (The Brothers' War #244)
Sphinx's Herald (Shards of Alara #58)
Steel Wall (Duel Decks: Mirrodin Pure vs. New Phyrexia #3)
Straw Golem (Weatherlight #158)
Thraben Gargoyle // Stonewing Antagonizer (Shadows over Innistrad #266)
Thraben Gargoyle // Stonewing Antagonizer (Shadows over Innistrad #266)
Universal Automaton (Modern Horizons #235)
Walking Bulwark (Dominaria United #241)
Whispergear Sneak (Conspiracy #64)

Their mind whirled with grand plans, never thinking of what might happen if they got to the end of the list.