39 cards where the card types include “artifact” and the name includes “n of” and the USD price < 0.4

Baton of Courage (Fifth Dawn #105)
Baton of Morale (Ice Age #313)
Crown of Convergence (Ravnica: City of Guilds #258)
Crown of Empires (Magic 2012 #203)
Crown of Gondor (Tales of Middle-earth Commander #75)
Custodian of the Trove (Dragons of Tarkir #236)
Fountain of Ichor (Modern Horizons #223)
Fountain of Renewal (Core Set 2019 #235)
Fountain of Youth (Tenth Edition #323)
Guardian of the Ages (Magic 2014 #211)
Horn of Deafening (Chronicles #100)
Horn of Plenty (Mercadian Masques #298)
Horn of the Mark (The Lord of the Rings: Tales of Middle-earth #241)
Horn of Valhalla // Ysgard's Call (Commander Legends: Battle for Baldur's Gate #26)
Hylda's Crown of Winter (Wilds of Eldraine #247)
Icon of Ancestry (The Lost Caverns of Ixalan Commander #305)
Invasion of Kaladesh // Aetherwing, Golden-Scale Flagship (March of the Machine #234)
Invasion of Kaladesh // Aetherwing, Golden-Scale Flagship (March of the Machine #234)
Invasion of New Capenna // Holy Frazzle-Cannon (March of the Machine #238)
Invasion of New Capenna // Holy Frazzle-Cannon (March of the Machine #238)
Invasion of Ravnica // Guildpact Paragon (March of the Machine #1)
Invasion of Ravnica // Guildpact Paragon (March of the Machine #1)
Invasion of Vryn // Overloaded Mage-Ring (March of the Machine #64)
Invasion of Vryn // Overloaded Mage-Ring (March of the Machine #64)
Javelin of Lightning (Commander Legends: Battle for Baldur's Gate #185)
Lantern of Revealing (Commander Legends: Battle for Baldur's Gate #318)
Lantern of the Lost (Innistrad: Crimson Vow #259)
Paragon of Modernity (Streets of New Capenna #242)
Potion of Healing (Adventures in the Forgotten Realms #34)
Talisman of Conviction (Murders at Karlov Manor Commander #240)
Talisman of Curiosity (Murders at Karlov Manor Commander #241)
Talisman of Progress (Murders at Karlov Manor Commander #243)
Talisman of Resilience (Duskmourn: House of Horror Commander #255)
Talisman of Unity (Murders at Karlov Manor Commander #244)
Talon of Pain (Darksteel #150)
Thorn of Amethyst (The Brothers' War Retro Artifacts #123)
Trigon of Corruption (Scars of Mirrodin #213)
Trigon of Infestation (Scars of Mirrodin #214)
Trigon of Mending (Scars of Mirrodin #215)
Trigon of Rage (Scars of Mirrodin #216)
Trigon of Thought (Scars of Mirrodin #217)
Urn of Godfire (March of the Machine #266)
Warden of the Wall (Dark Ascension #153)

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