Zethi, Arcane Blademaster + Lithoform Engine + Aphetto Alchemist + Roar of the Kha Combo

Roar of the Kha in exile (Roar of the Kha 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 .

Declare Zethi as an attacker, triggering its second ability.

Holding priority, activate all mana producing creatures you control by tapping them, adding at least .

Activate Lithoform Engine's first ability by paying and tapping it, copying Zethi's triggered ability.

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 Roar of the Kha.

Resolve the Roar of the Kha copy, untapping all creatures you control.

Activate Aphetto Alchemist by tapping it, untapping Lithoform Engine.

Repeat from step 2.

Once you have infinite mana, you may use that mana to then cast the copies of all other cards exiled with kick counters on them.

Infinite casts of all cards exiled with kick counters on them

Infinite magecraft triggers

Infinite mana creatures you control can produce

Infinite mana nonland permanents you control can produce

Infinite storm count

Infinite untap of creatures you control