How can you create a combo with Zethi, Arcane Blademaster, Lithoform Engine, Aphetto Alchemist, To Arms!?
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[START OF COMBO]This combo can be formed with Zethi, Arcane Blademaster, Lithoform Engine, Aphetto Alchemist, To Arms!

Color identity: WU
Mana cost: 
Steps:
  1. Declare Zethi as an attacker, triggering its second ability.
  2. Holding priority, activate all mana producing creatures you control by tapping them, adding at least {4}{W}.
  3. Activate Lithoform Engine's first ability by paying {2} and tapping it, copying Zethi's triggered ability.
  4. Resolve the copy of Zethi's ability, creating a copy of each card exiled with a kick counter of it and causing you to pay {1}{W} to cast the copy of To Arms!.
  5. Resolve the To Arms! copy, untapping all creatures you control and drawing a card.
  6. Activate Aphetto Alchemist by tapping it, untapping Lithoform Engine.
  7. Repeat from step 2.[END OF COMBO STEPS]

Result:
  - Infinite card draw
  - Infinite draw triggers
  - Near-infinite magecraft triggers
  - Near-infinite mana nonland permanents you control can produce
  - Near-infinite storm count
  - Near-infinite untap of creatures you control[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Zethi, Arcane Blademaster must be on the battlefield
  - Lithoform Engine must be on the battlefield
  - Aphetto Alchemist must be on the battlefield
  - To Arms! must be exiled
  - To Arms! is exiled with a kick counter on it.
  - Zethi and Aphetto Alchemist do not have summoning sickness.
  - Creatures you control can tap to produce at least {4}{W}.
[END OF COMBO PREREQUISITES]
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