Mikaeus, the Unhallowed + Bloodied Ghost + Shilgengar, Sire of Famine

Mikaeus, the Unhallowed

Bloodied Ghost

Shilgengar, Sire of Famine

How it works

1. Activate Shilgengar by sacrifiicing Bloodied Ghost.
2. When Bloodied Ghost dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it. When it enters, Bloodied Ghost will put a -1/-1 counter on itself, removing the +1/+1 counter.
3. Resolve the Shilgengar ability.
4. Repeat.