Mikaeus, the Unhallowed + Shilgengar, Sire of Famine + Gravelgill Axeshark

Mikaeus, the Unhallowed

Shilgengar, Sire of Famine

Gravelgill Axeshark

How it works

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