Primal Prayers + Aetherstorm Roc + Whitemane Lion

Primal Prayers

Aetherstorm Roc

Whitemane Lion

How it works

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