45 cards where the mana value > 7 and the card types include “artifact” and the color identity ≤ RU

Blightsteel Colossus (Double Masters #235)
Darksteel Forge (Double Masters #248)
Portal to Phyrexia (The Brothers' War #240)
Metalwork Colossus (Commander Masters #960)
Triplicate Titan (Commander 2021 #79)
Phyrexian Triniform (Commander Masters #969)
Cityscape Leveler (The Brothers' War #233)
Scion of Draco (Modern Horizons 2 #234)
The Magic Mirror (Throne of Eldraine #51)
Ancient Stone Idol (Murders at Karlov Manor Commander #222)
Inkwell Leviathan (Double Masters #55)
Darksteel Monolith (Commander Masters #743)
Mycosynth Golem (Fifth Dawn #137)
Darksteel Colossus (Magic 2010 #208)
Maelstrom Colossus (Commander Legends #322)
Platinum Emperion (Ultimate Masters #233)
Hulking Metamorph (The Brothers' War #79)
Colossus of Akros (Theros #214)
Bosh, Iron Golem (Commander 2021 #237)
Graaz, Unstoppable Juggernaut (Phyrexia: All Will Be One #229)
Gate Colossus (Ravnica Remastered #257)
Draco (Planeshift #131)
Su-Chi Cave Guard (The Brothers' War #249)
Skitterbeam Battalion (The Brothers' War #165)
Arcbound Overseer (Darksteel #99)
Marut (Commander Legends: Battle for Baldur's Gate #322)
Walking Skyscraper (Kamigawa: Neon Dynasty #263)
Nullstone Gargoyle (Ravnica: City of Guilds #266)
Possessed Portal (Fifth Dawn #144)
Spotter Thopter (The Brothers' War #80)
Fallaji Dragon Engine (The Brothers' War #159)
Depth Charge Colossus (The Brothers' War #78)
Teeka's Dragon (Mirage #320)
Suncrusher (Fifth Dawn #159)
Aladdin's Lamp (Fourth Edition #291)
Colossus of Sardia (Masters Edition IV #193)
Stratadon (Planeshift #135)
Aladdin's Ring (Ninth Edition #286)
Xanthic Statue (Weatherlight #163)
Omniclown Colossus // Pie-roclasm (Unfinity #116)
Angelic Rocket (Unstable #139)
Everythingamajig (Unstable #147f)
Gleemax (Unhinged #121)
Mox Lotus (Unhinged #124)
Sundering Titan (Double Masters #292)

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