Gwenna, Eyes of Gaea + Cloudstone Curio + Sheltering Ancient + Tempting Wurm

Gwenna, Eyes of Gaea

Cloudstone Curio

Sheltering Ancient

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 Sheltering Ancient 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 Sheltering Ancient by paying 1.
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.

This cunning loop relies on Gwenna, Eyes of Gaea to fund your creature spells while constantly untapping herself whenever a large enough threat hits the board. To feed that trigger, you alternate casting Tempting Wurm and Sheltering Ancient, using Cloudstone Curio's clever bounce ability to swap them back and forth between the battlefield and your hand. While Tempting Wurm invites your opponents to flood the board from their hands, and Sheltering Ancient threatens to grow their creatures via cumulative upkeep, your repeating cycle completely bypasses these drawbacks to rack up an infinite storm count and endless creature triggers.