Iridescent Tiger | Cloudstone Curio | Roaming Throne

Cards

Iridescent Tiger in hand.
Cloudstone Curio and
Roaming Throne on the battlefield (
Roaming Throne with "Cat" chosen).

You control and own a nontoken nonartifact creature that can be cast using at most six in any combination of ({W} magic symbol) ({W} magic symbol) ({U} magic symbol) ({U} magic symbol) ({B} magic symbol) ({B} magic symbol) ({R} magic symbol) ({G} magic symbol) ({G} magic symbol) mana.

Cast
Iridescent Tiger by paying ({4} magic symbol) ({R} magic symbol) .
When
Iridescent Tiger enters the battlefield, it and
Cloudstone Curio trigger twice.
Resolve the
Iridescent Tiger triggers, adding ({W} magic symbol) ({W} magic symbol) ({U} magic symbol) ({U} magic symbol) ({B} magic symbol) ({B} magic symbol) ({R} magic symbol) ({R} magic symbol) ({G} magic symbol) ({G} magic symbol) .
Resolve the first
Cloudstone Curio trigger, returning a nontoken nonartifact creature that can be cast using at most six in any combination of ({W} magic symbol) ({W} magic symbol) ({U} magic symbol) ({U} magic symbol) ({B} magic symbol) ({B} magic symbol) ({R} magic symbol) ({G} magic symbol) ({G} magic symbol) 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.