Primal Prayers + Aetherstorm Roc + Kor Skyfisher

Primal Prayers

Aetherstorm Roc

Kor Skyfisher

How it works

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