"Delicate resonance detectors could scan the assembly lines for metallic impurities, loose bolts, and freak occurrences of sentience."
—Tawnos, proposal for overseer prototype

Foundry Inspector

Artifact spells you cast cost {1} less to cast.

Automaton inspectors ensure that the Consulate's stringent standards for mass production are upheld.

Commander Masters

The Brothers' War Retro Artifacts

Neon Dynasty Commander

If an artifact spell has {X} in its mana cost, choose the value for X first, and then reduce the cost by {1}. For example, an artifact that costs {X} with X chosen as 4 costs {3} to cast if you control Foundry Inspector.

Once a player has announced an artifact spell, no player may take actions to try to remove Foundry Inspector from the battlefield before that spell's cost is locked in.