Saffi Eriksdotter + Spawning Pit + Shepherd of the Cosmos

Saffi Eriksdotter

Spawning Pit

Shepherd of the Cosmos

How it works

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