Saffi Eriksdotter + Yahenni, Undying Partisan + Metamorphosis Fanatic

Saffi Eriksdotter

Yahenni, Undying Partisan

Metamorphosis Fanatic

How it works

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