Cast the creature with mana value 0 from your hand by paying {0}.
Rendmaw triggers, causing each player to create a tapped 2/2 Bird creature token.
When the Bird enters the battlefield under your control, Cloudstone Curio triggers, returning a nontoken creature with mana value 0 from the battlefield to your hand.
Resolve the creature spell cast in step 1.
Repeat.

Infinite artifact LTB

Infinite creature LTB

Infinite storm count

Infinite creature ETB for all players

Infinite tapped creature tokens for all players

Rendmaw, Creaking Nest

Cloudstone Curio

Memnite

Ornithopter

Phyrexian Walker

Shield Sphere

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