Metamorphosis Fanatic + Prowling Geistcatcher + Thermopod

Metamorphosis Fanatic

Prowling Geistcatcher

Thermopod

How it works

1. Activate Thermopod by sacrificing Metamorphosis Fanatic.
2. When Metamorphosis Fanatic dies, Prowling Geistcatcher's first ability triggers, exiling Metamorphosis Fanatic from your graveyard.
3. Activate Thermopod by sacrificing Prowling Geistcatcher.
4. When Prowling Geistcatcher dies, its second ability triggers, returning Metamorphosis Fanatic from exile to the battlefield.
5. When Metamorphosis Fanatic enters the battlefield, it triggers, returning Prowling Geistcatcher from your graveyard to the battlefield.
6. Repeat.