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 ETB

Infinite LTB

Infinite sacrifice triggers

Nim Deathmantle

Krark-Clan Ironworks

Mintstrosity

Biotransference

Mycosynth Lattice

Encroaching Mycosynth

Combos with "Mintstrosity"