Mikaeus, the Unhallowed + Bloodied Ghost + Yahenni, Undying Partisan

Mikaeus, the Unhallowed

Bloodied Ghost

Yahenni, Undying Partisan

How it works

1. Activate Yahenni 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 Yahenni ability.
4. Repeat.