Metamorphosis Fanatic + Prowling Geistcatcher + Altar of Dementia

Metamorphosis Fanatic

Prowling Geistcatcher

Altar of Dementia

How it works

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