Mikaeus, the Unhallowed + Shilgengar, Sire of Famine + Putrid Goblin

Mikaeus, the Unhallowed

Shilgengar, Sire of Famine

Putrid Goblin

How it works

1. Activate Shilgengar by sacrificing Putrid Goblin.
2. When Putrid Goblin 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 Putrid Goblin.
5. When Putrid Goblin 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.