Saffi Eriksdotter + Hero of the Dunes + Yahenni, Undying Partisan

Saffi Eriksdotter

Hero of the Dunes

Yahenni, Undying Partisan

How it works

1. Activate Saffi by sacrificing it, targeting Hero of the Dunes
2. Activate Yahenni by sacrificing Hero of the Dunes
3. When Hero of the Dunes dies, Saffi triggers, returning Hero of the Dunes from your graveyard to the battlefield.
4. When Hero of the Dunes enters, it triggers, returning Saffi from your graveyard to the battlefield.
5. Resolve the Yahenni ability.
6. Repeat.