16 cards where the card is tagged “cost-reducer-artifact”

Artificer Class (Commander Legends: Battle for Baldur's Gate #663)
Cloud Key (Time Spiral Remastered #265)
Enthusiastic Mechanaut (Kamigawa: Neon Dynasty #218)
Esper (March of the Machine Commander #49)
Etherium Sculptor (Neon Dynasty Commander #92)
Foundry Beetle (Alchemy: Kamigawa #19)
Foundry Inspector (Commander Masters #385)
Jhoira's Familiar (Double Masters #265)
Richlau, Headmaster (Alchemy: The Brothers' War #23)
Saheeli, Filigree Master (The Brothers' War #219)
Saheeli, Filigree Master Emblem (The Brothers' War Tokens #12)
Starnheim Courser (Kaldheim #32)
Stenn, Paranoid Partisan (Dominaria United #221)
The Pieces Are Coming Together (Archenemy Schemes #35★)
Urza, Lord Protector (The Brothers' War #225)
Urza, Planeswalker (The Brothers' War #238b)

The orcs’ banner sends a clear message: “You've reached the end of this search.”