Cast Roar of the Kha by paying {1}{W}.
Kitsa's prowess ability triggers, giving it +1/+1 until end of turn.
Holding priority, activate any number of creatures by tapping them, adding at least {2}.
Activate Kitsa's second ability by paying {2} and tapping it, copying Roar of the Kha.
Resolve the copy of Roar of the Kha, untapping all creatures you control.
Repeat from step 3.

Infinite untap of creatures you control

Infinite mana creatures you control can produce

Infinite magecraft triggers

Kitsa, Otterball Elite

Roar of the Kha

Activate any number of creatures by tapping them, adding at least {2}.
Activate Isochron Scepter by paying {2} and tapping it, casting a copy of Roar of the Kha without paying its mana cost.
Resolve Roar of the Kha, untapping all creatures you control
Activate Vizier of Tumbling Sands by tapping it, untapping Isochron Scepter.
Repeat.

Infinite storm count

Isochron Scepter

Vizier of Tumbling Sands

Activate any number of creatures by tapping it, adding at least {2}.
Activate Elite Arcanist by paying {2} and tapping it, copying Roar of the Kha and casting the copy without paying its mana cost.
Resolve the copy of Roar of the Kha, untapping all creatures you control.
Repeat.

Elite Arcanist

Animate Isochron Scepter using The Blackstaff of Waterdeep.
Activate any number of creatures by tapping them, adding at least {2}.
Activate Isochron Scepter by paying {2} and tapping it, casting a copy of Roar of the Kha without paying its mana cost.
Resolve Roar of the Kha, untapping all creatures you control
Repeat from step 2.

The Blackstaff of Waterdeep

Declare Zethi as an attacker, triggering its second ability.
Holding priority, activate all mana producing creatures you control by tapping them, adding at least {4}{W}.
Activate Lithoform Engine's first ability by paying {2} 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 {1}{W} 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 mana nonland permanents you control can produce

Zethi, Arcane Blademaster

Lithoform Engine

Aphetto Alchemist

Activate any number of creatures you control by tapping them, adding at least {5}{G}.
Activate Isochron Scepter by paying {2} and tapping it, casting a copy of Roar of the Kha without paying its mana cost.
Resolve Roar of the Kha, untapping all creatures you control.
Activate Elder Druid by paying {3}{G} and tapping it, untapping Isochron Scepter.
Repeat.

Combos with "Roar of the Kha"