Mikaeus, the Unhallowed + Bloodied Ghost + Bartolomé del Presidio

Mikaeus, the Unhallowed

Bloodied Ghost

Bartolomé del Presidio

How it works

1. Activate Bartolomé del Presidio 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 Bartolomé del Presidio ability.
4. Repeat.