How can you create a combo with Cauldron of Souls, Dross Scorpion, Extruder?
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[START OF COMBO]This combo can be formed with Cauldron of Souls, Dross Scorpion, Extruder

Color identity: C
Mana cost: 
Steps:
  1. 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.
  2. Activate Extruder by sacrificing it, targeting the other artifact creature.
  3. When Extruder dies, its persist ability and Dross Scorpion trigger.
  4. Resolve the Dross Scorpion trigger, untapping Cauldron of Souls.
  5. Resolve the Extruder trigger, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
  6. Resolve the Extruder ability from step 2, putting a +1/+1 on the targeted creature.
  7. Activate Extruder by sacrificing the other artifact creature, targeting Extruder.
  8. When the creature dies, its persist ability and Dross Scorpion triggers.
  9. Resolve the Dross Scorpion trigger, untapping any artifact you control.
  10. Resolve the persist trigger, returning the creature from your graveyard to the battlefield with a -1/-1 counter on it.
  11. Resolve the Extruder ability, putting a +1/+1 counter on it.
  12. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite leaves the battlefield
  - Infinite enters the battlefield
  - Infinite sacrifice triggers
  - Infinite death triggers
  - Infinite mana artifacts you control can produce
  - Infinite untap of artifacts you control[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - You control another artifact creature with base toughness 2 or greater.
  - Extruder does not have a -1/-1 counter on it.
[END OF COMBO PREREQUISITES]
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