Mikaeus, the Unhallowed + Shilgengar, Sire of Famine + Trapjaw Kelpie

Mikaeus, the Unhallowed

Shilgengar, Sire of Famine

Trapjaw Kelpie

How it works

1. Activate Shilgengar by sacrificing Trapjaw Kelpie.
2. When Trapjaw Kelpie 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 Trapjaw Kelpie.
5. When Trapjaw Kelpie 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.