Junji, the Midnight Sky + Phyrexian Altar + Relic Vial + Metamorphosis Fanatic

Junji, the Midnight Sky

Phyrexian Altar

Relic Vial

Metamorphosis Fanatic

How it works

1. Activate Phyrexian Altar by sacrificing Metamorphosis Fanatic.
2. When Metamorphosis Fanatic dies, Relic Vial triggers, causing you to gain 1 life and each opponent to lose 1 life.
3. Activate Phyrexian Altar by sacrificing Junji.
4. When Junji dies, it and Relic Vial trigger.
5. Resolve the Relic Vial trigger, causing you to gain 1 life and each opponent to lose 1 life.
6. Resolve the Junji trigger, returning Metamorphosis Fanatic from your graveyard to the battlefield and causing you to lose 2 life.
7. When Metamorphosis Fanatic enters, it triggers, returning Junji from your graveyard to the battlefield.
8. Repeat.