Activate Krark-Clan Ironworks by sacrificing Mintstrosity, adding {C}{C}.
When Mintstrosity dies, it and Nim Deathmantle triggers.
Resolve the Mintstrosity trigger, creating a Food artifact token.
Activate Krark-Clan Ironworks by sacrificing the Food, adding {C}{C}.
Resolve the Nim Deathmantle trigger from step 2, causing you to pay {4} to return Mintstrosity from your graveyard to the battlefield, and attach Nim Deathmantle to it.
Repeat.

Infinite death triggers

Infinite creature ETB

Infinite creature LTB

Infinite creature sacrifice triggers

Nim Deathmantle

Krark-Clan Ironworks

Mintstrosity

Biotransference

Mycosynth Lattice

Encroaching Mycosynth

Combos with "Mintstrosity"