Zethi, Arcane Blademaster
Lithoform Engine
Aphetto Alchemist
To Arms!

   Prerequisites

What do I need to start this combo?
To Arms! in exile (To Arms! with a kick counter on it in exile).
All other permanents on the battlefield.
Zethi and Aphetto Alchemist do not have summoning sickness. Creatures you control can tap to produce at least 4.

   Steps

How does this combo work?
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.
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 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

What do I get from this combo?
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
Zethi, Arcane Blademaster
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