Primal Prayers + Aetherstorm Roc + Shrieking Drake

Primal Prayers

Aetherstorm Roc

Shrieking Drake

How it works

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