Metalwork Colossus + Genesis Chamber + Pitiless Plunderer + Krark-Clan Ironworks

Metalwork Colossus

Genesis Chamber

Pitiless Plunderer

Krark-Clan Ironworks

How it works

1. Cast Metalwork Colossus by paying at most 1.
2. When Metalwork Colossus enters the battlefield, Genesis Chamber triggers, creating a 1/1 Myr artifact creature token.
3. Activate Krark-Clan Ironworks by sacrificing Metalwork Colossus, adding CC.
4. When Metalwork Colossus dies, Pitiless Plunderer triggers, creating a Treasure token.
5. Activate Metalwork Colossus by sacrificing the Treasure and Myr, returning it from your graveyard to your hand.
6. Repeat.