Farid, Enterprising Salvager + Metalwork Colossus + Slagstone Refinery + Krark-Clan Ironworks

Farid, Enterprising Salvager

Metalwork Colossus

Slagstone Refinery

Krark-Clan Ironworks

How it works

1. Activate Krark-Clan Ironworks by sacrificing Metalwork Colossus, adding CC.
2. When Metlwork Colossus dies, Slagstone Refinery and Farid trigger.
3. Resolve the Slagstone Refinery trigger, creating a tapped Powerstone artifact token.
4. Resolve the Farid trigger, creating a Scrap artifact token.
5. Activate Metalwork Colossus by sacrificing the Powerstone token and the Scrap token, returning Metalwork Colossus from your graveyard to your hand.
6. Cast Metalwork Colossus by paying at most 1.
7. Repeat.