Zethi, Arcane Blademaster, Lithoform Engine, Aphetto Alchemist, and To Arms!

Prerequisites

• Zethi, Arcane Blademaster on the battlefield
• Lithoform Engine on the battlefield
• Aphetto Alchemist on the battlefield
• To Arms! in exile
• 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

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
3. Activate Lithoform Engine's first ability by paying 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 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

Results

• 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
• Near-infinite mana creatures you control can produce