Oviya, Automech Artisan + Earthcraft + Cloudstone Curio

Oviya, Automech Artisan

Earthcraft

Cloudstone Curio

How it works

1. Activate a Forest by tapping it, adding .
2. Activate Oviya by paying and tapping it, putting a nonartifact creature card from your hand onto the battlefield.
3. When the creature enters, Cloudstone Curio triggers, returning another nontoken nonartifact creature from the battlefield to your hand.
4. Activate Earthcraft by tapping the creature put onto the battlefield, untapping the basic Forest.
5. Repeat.