Activate Gwenna by tapping it, adding {1}{G} that can only be spent to cast creature spells or activate abilities of creatures.
Cast Tempting Wurm by paying {1}{G}.
Gwenna triggers, putting a +1/+1 counter on it and untapping it.
Tempting Wurm enters the battlefield, triggering itself and Cloudstone Curio.
Resolve the Tempting Wurm trigger, allowing each opponent to put any number of artifact, enchantment, creature and/or land cards from their hand onto the battlefield.
Resolve the Cloudstone Curio trigger, returning Sheltering Ancient from the battlefield to your hand.
Activate Gwenna by tapping it, adding {1}{G} that can only be spent to cast creature spells or activate abilities of creatures.
Cast Sheltering Ancient by paying {1}{G}.
Gwenna triggers, putting a +1/+1 counter on it and untapping it.
Sheltering Ancient enters the battlefield, triggering Cloudstone Curio, returning Tempting Wurm from the battlefield to your hand.
Repeat.

Infinite +1/+1 counters on a creature

Infinite ETB

Infinite LTB

Infinite storm count

Gwenna, Eyes of Gaea

Cloudstone Curio

Sheltering Ancient

Tempting Wurm

Activate Gwenna by tapping it, adding {1}{G} that can only be spent to cast creature spells or activate abilities of creatures.
Cast Tempting Wurm by paying {1}{G}.
Gwenna triggers, putting a +1/+1 counter on it and untapping it.
Tempting Wurm enters the battlefield, triggering itself and Cloudstone Curio.
Resolve the Tempting Wurm trigger, allowing each opponent to put any number of artifact, enchantment, creature and/or land cards from their hand onto the battlefield.
Resolve the Cloudstone Curio trigger, returning Grim Wanderer from the battlefield to your hand.
Activate Gwenna by tapping it, adding {1}{B} that can only be spent to cast creature spells or activate abilities of creatures.
Cast Grim Wanderer by paying {1}{B}.
Gwenna triggers, putting a +1/+1 counter on it and untapping it.
Grim Wanderer enters the battlefield, triggering Cloudstone Curio, returning Tempting Wurm from the battlefield to your hand.
Repeat.

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