Color Identity: C

Initial Card State
- All permanents on the battlefield.
Notable Prerequisites
- You control another artifact creature with base toughness 2 or greater.
- Extruder does not have a -1/-1 counter on it.
Steps
- Activate Cauldron of Souls by tapping it, giving Extruder and the other artifact creature with base toughness 2 or greater persist until end of turn.
- Activate Extruder by sacrificing it, targeting the other artifact creature.
- When Extruder dies, its persist ability and Dross Scorpion trigger.
- Resolve the Dross Scorpion trigger, untapping Cauldron of Souls.
- Resolve the Extruder trigger, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
- Resolve the Extruder ability from step 2, putting a +1/+1 on the targeted creature.
- Activate Extruder by sacrificing the other artifact creature, targeting Extruder.
- When the creature dies, its persist ability and Dross Scorpion triggers.
- Resolve the Dross Scorpion trigger, untapping any artifact you control.
- Resolve the persist trigger, returning the creature from your graveyard to the battlefield with a -1/-1 counter on it.
- Resolve the Extruder ability, putting a +1/+1 counter on it.
- Repeat.
Results
- Infinite LTB.
- Infinite ETB.
- Infinite sacrifice triggers.
- Infinite death triggers.
- Infinite mana artifacts you control can produce.
- Infinite untap of artifacts you control.
Bracket Tag
This combo has been estimated to be Exhibition (Bracket 1+).