Mikaeus, the Unhallowed + Restless Apparition + Carrion Feeder

Mikaeus, the Unhallowed

Restless Apparition

Carrion Feeder

How it works

1. Activate Carrion Feeder by sacrificing Restless Apparition.
2. When Restless Apparition dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
3. Resolve the Carrion Feeder ability.
4. Activate Carrion Feeder by sacrificing Restless Apparition.
5. When Restless Apparition dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
6. Resolve the Carrion Feeder ability.
7. Repeat.