Requires

Steps

1. Activate Gwenna by tapping it, adding that can only be spent to cast creature spells or activate abilities of creatures.
2. Cast Tempting Wurm by paying .
3. Gwenna triggers, putting a +1/+1 counter on it and untapping it.
4. Tempting Wurm enters the battlefield, triggering itself and Cloudstone Curio.
5. 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.
6. Resolve the Cloudstone Curio trigger, returning Sheltering Ancient from the battlefield to your hand.
7. Activate Gwenna by tapping it, adding that can only be spent to cast creature spells or activate abilities of creatures.
8. Cast Sheltering Ancient by paying .
9. Gwenna triggers, putting a +1/+1 counter on it and untapping it.
10. Sheltering Ancient enters the battlefield, triggering Cloudstone Curio, returning Tempting Wurm from the battlefield to your hand.
11. Repeat.

Results