Mikaeus, the Unhallowed + Wingrattle Scarecrow + Bartolomé del Presidio

Mikaeus, the Unhallowed

Wingrattle Scarecrow

Bartolomé del Presidio

How it works

1. Activate Bartolomé del Presidio by sacrificing Wingrattle Scarecrow.
2. When Wingrattle Scarecrow dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
3. Resolve the Bartolomé del Presidio ability.
4. Activate Bartolomé del Presidio by sacrificing Wingrattle Scarecrow.
5. When Wingrattle Scarecrow dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
6. Resolve the Bartolomé del Presidio ability.
7. Repeat.