Mikaeus, the Unhallowed + Bloodied Ghost + Hammerhead, Maggia Boss

Mikaeus, the Unhallowed

Bloodied Ghost

Hammerhead, Maggia Boss

How it works

1. Activate Hammerhead 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 Hammerhead ability.
4. Repeat.
5. Activate Hammerhead by sacrificing Bloodied Ghost.
6. When Bloodied Ghost dies, its undying ability triggers, returning it from your graveyard to the battlefield without a +1/+1 counter on it due to its replacement effect.
7. Resolve the Hammerhead ability
8. Repeat.