How can you create a combo with Ertha Jo, Frontier Mentor, Aphetto Alchemist?
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[START OF COMBO]This combo can be formed with Ertha Jo, Frontier Mentor, Aphetto Alchemist

Color identity: URW
Mana cost: 
Steps:
  1. Activate Aphetto Alchemist by tapping it, targeting itself.
  2. Ertha Jo's second ability triggers, copying Aphetto Alchemist's ability, targeting any other creature or artifact.
  3. Resolve both Aphetto Alchemist abilities, untapping it and the other targeted creature or artifact.
  4. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite mana artifacts you control can produce
  - Infinite mana creatures you control can produce
  - Infinite untap of artifacts you control
  - Infinite untap of creatures you control[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Aphetto Alchemist does not have summoning sickness.
[END OF COMBO PREREQUISITES]
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