Metalwork Colossus + Warren Soultrader + Pitiless Plunderer + Aetherflux Reservoir

Metalwork Colossus

Warren Soultrader

Pitiless Plunderer

Aetherflux Reservoir

How it works

1. Cast Metalwork Colossus by paying 0.
2. Aetherflux Reservoir triggers, causing you to gain 1 life for each spell you've cast this turn.
3. Activate Warren Soultrader by paying 1 life and sacrificing Metalwork Colossus.
4. When Metalwork Colossus dies, Pitiless Plunderer triggers, creating a Treasure token.
5. Resolve the Warren Soultrader ability, creating a Treasure token.
6. Activate Metalwork Colossus by sacrificing the Treasures, returning Metalwork Colossus from your graveyard to your hand.
7. Repeat.
8. Once you have infinite life, you may activate Aetherflux Reservoir infinitely to deal infinite damage to any target(s).