Gwenna, Eyes of Gaea + Cloudstone Curio + Grim Wanderer + Tempting Wurm

Gwenna, Eyes of Gaea

Cloudstone Curio

Grim Wanderer

Tempting Wurm

How it works

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