Oviya, Automech Artisan, Earthcraft, and Cloudstone Curio

Prerequisites

• Oviya, Automech Artisan on the battlefield
• Earthcraft on the battlefield
• Cloudstone Curio on the battlefield

Steps

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

Results

• Infinite ETB
• Infinite LTB