Mikaeus, the Unhallowed + Viscera Seer + Restless Apparition

Mikaeus, the Unhallowed

Viscera Seer

Restless Apparition

How it works

1. Activate Viscera Seer 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 Viscera Seer ability.
4. Activate Viscera Seer 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 Viscera Seer ability.
7. Repeat.