Primal Prayers + Aetherstorm Roc + Dream Stalker

Primal Prayers

Aetherstorm Roc

Dream Stalker

How it works

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