Primal Prayers + Aetherstorm Roc + Stonecloaker

Primal Prayers

Aetherstorm Roc

Stonecloaker

How it works

1. Cast Stonecloaker by paying E due to Primal Prayers, if able, or by paying its mana cost.
2. When Stonecloaker enters the battlefield, it and Aetherstorm Roc trigger.
3. Resolve the Aetherstorm Roc trigger, causing you to get E.
4. Resolve the Stonecloaker trigger, returning it from the battlefield to your hand.
5. Repeat.