Activate Beastcaller Savant by tapping it, adding {G} that can only be spent to cast a creature spell.
Cast Kobolds of Kher Keep by paying {0}.
When Kobolds of Kher Keep enters the battlefield, Cloudstone Curio triggers, returning Beastcaller Savant to your hand from the battlefield.
Cast Beastcaller Savant by paying {G} due to Bosk Banneret.
When Beastcaller Savant enters the battlefield, Cloudstone Curio triggers, returning Kobolds of Kher Keep to your hand from the battlefield.
Repeat.

Infinite creature ETB

Infinite creature LTB

Infinite storm count

Cloudstone Curio

Beastcaller Savant

Bosk Banneret

Kobolds of Kher Keep

Activate Beastcaller Savant by tapping it, adding {G} that can only be spent to cast a creature spell.
Cast Crookshank Kobolds by paying {0}.
When Crookshank Kobolds enters the battlefield, Cloudstone Curio triggers, returning Beastcaller Savant to your hand from the battlefield.
Cast Beastcaller Savant by paying {G} due to Bosk Banneret.
When Beastcaller Savant enters the battlefield, Cloudstone Curio triggers, returning Crookshank Kobolds to your hand from the battlefield.
Repeat.

Crookshank Kobolds

Activate Beastcaller Savant by tapping it, adding {G} that can only be spent to cast a creature spell.
Cast Crimson Kobolds by paying {0}.
When Crimson Kobolds enters the battlefield, Cloudstone Curio triggers, returning Beastcaller Savant to your hand from the battlefield.
Cast Beastcaller Savant by paying {G} due to Bosk Banneret.
When Beastcaller Savant enters the battlefield, Cloudstone Curio triggers, returning Crimson Kobolds to your hand from the battlefield.
Repeat.

Crimson Kobolds

Activate Beastcaller Savant by tapping it, adding {G} that can only be spent to cast a creature spell.
Cast Rograkh either from your hand or from the command zone by paying {0} plus commander tax, if applicable.
When Rograkh enters the battlefield, Cloudstone Curio triggers, returning Beastcaller Savant to your hand from the battlefield.
Cast Beastcaller Savant by paying {G} due to Bosk Banneret.
When Beastcaller Savant enters the battlefield, Cloudstone Curio triggers, returning Rograkh to your hand from the battlefield.
Repeat.

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