Gwenna, Eyes of Gaea + Cloudstone Curio + Death's Shadow

Gwenna, Eyes of Gaea

Cloudstone Curio

Death's Shadow

How it works

1. Activate Gwenna by tapping it, adding 1 that can only be spent to cast creature spells or to activate abilities of creature cards.
2. Cast Death's Shadow by paying .
3. Gwenna triggers, putting a +1/+1 counter on it and untapping it.
4. When Death's Shadow enters the battlefield, Cloudstone Curio triggers, returning another nontoken nonartifact creature that can be cast using one colored mana from the battlefield to your hand.
5. Cast the creature by paying its mana cost.
6. When the creature enters the battlefield, Cloudstone Curio triggers, returning Death's Shadow from the battlefield to your hand.
7. Repeat.