Anticausal Vestige + Paleoloth + Body Double + Yahenni, Undying Partisan

Anticausal Vestige

Paleoloth

Body Double

Yahenni, Undying Partisan

How it works

1. Activate Yahenni by sacrificing Anticausal Vestige.
2. When Anticausal Vestige dies, it triggers, causing you to draw a card and put Body Double from your hand onto the battlefield tapped. Choose to have Body Double enter as a copy of Anticausal Vestige.
3. When Body Double enters, Paleoloth triggers, returning Anticausal Vestige from your graveyard to your hand.
4. Resolve the Yahenni ability.
5. Activate Yahenni by sacrificing Body Double.
6. When Body Double dies, it triggers, causing you to draw a card and put Anticausal Vestige from your hand onto the battlefield tapped.
7. When Anticausal Vestige enters, Paleoloth triggers, returning Body Double from your graveyard to your hand.
8. Resolve the Yahenni ability.
9. Repeat.