Activate Krark-Clan Ironworks by sacrificing another artifact creature, adding {C}{C}.
When the creature dies, Nick Valentine triggers, creating a Clue token and a 1/1 Thopter artifact creature token.
Repeat.

Infinite artifact tokens

Infinite creature LTB

Infinite creature ETB

Infinite creature sacrifice triggers

Infinite death triggers

Infinite colorless mana

Infinite card draw

Infinite draw triggers

Infinite Clue tokens

Nick Valentine, Private Eye

Stridehangar Automaton

Krark-Clan Ironworks

Kill an artifact creature you control.
Nick Valentine triggers, creating a Clue artifact token.
The Clue enters the battlefield as a 0/0 artifact creature due to March of the Machines, and dies as a state-based action due to having 0 toughness.
Repeat from step 2.

March of the Machines

Activate Krark-Clan Ironworks by sacrificing another artifact creature, adding {C}{C}.
When the creature dies, Nick Valentine triggers, creating a Clue token that enters the battlefield as a 7/7 Dinosaur due to Displaced Dinosaurs.
Repeat.

Displaced Dinosaurs

Activate Halsin by paying {1}, causing an artifact token you control to become a 4/4 Bear in addition to its other types until end of turn.
Activate Krark-Clan Ironworks by sacrificing the Bear, adding {C}{C}.
When the Bear dies, Nick Valentine triggers, creating a Clue token.
Repeat.

Infinite artifact ETB

Infinite artifact LTB

Infinite artifact sacrifice triggers

Halsin, Emerald Archdruid

Cause another artifact creature you control to die.
When the artifact creature dies, Nick Valentine triggers, creating a Clue, Food and Treasure token due to Academy Manufactor.
As the Clue, Food and Treasure enter, they each become 7/7 Dinosaur artifact creatures in addition to their other types due to Displaced Dinosaurs.
Activate the Treasure by tapping and sacrificing it, adding one mana of any color.
Repeat from step 2.

Combos with "Nick Valentine, Private Eye"