Saffi Eriksdotter + Altar of Dementia + Metamorphosis Fanatic

Saffi Eriksdotter

Altar of Dementia

Metamorphosis Fanatic

How it works

1. Activate Saffi by sacrificing it, targeting Metamorphosis Fanatic
2. Activate Altar of Dementia 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 Altar of Dementia ability.
6. Repeat.