Cast Iridescent Tiger by paying {4}{R}.
When Iridescent Tiger enters the battlefield, it and Cloudstone Curio trigger twice.
Resolve the Iridescent Tiger triggers, adding {W}{W}{U}{U}{B}{B}{R}{R}{G}{G}.
Resolve the first Cloudstone Curio trigger, returning a nontoken nonartifact creature that can be cast using at most six in any combination of {W}{W}{U}{U}{B}{B}{R}{G}{G} mana from the battlefield to your hand.
Resolve the second Cloudstone Curio trigger, choosing to return nothing to your hand.
Cast the creature returned to your hand by paying its mana cost. 
When the creature enters the battlefield, Cloudstone Curio triggers twice, returning Iridescent Tiger from the battlefield to your hand with the first trigger and returning nothing with the second trigger.
Repeat.

Infinite creature LTB

Infinite creature ETB

Infinite colored mana

Infinite storm count

Iridescent Tiger

Cloudstone Curio

Roaming Throne

Yarok, the Desecrated

Elesh Norn, Mother of Machines

Panharmonicon

Starfield Vocalist

Mirror Room // Fractured Realm

Virtue of Knowledge // Vantress Visions

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