Mikaeus, the Unhallowed + Bartolomé del Presidio + Rendclaw Trow

Mikaeus, the Unhallowed

Bartolomé del Presidio

Rendclaw Trow

How it works

1. Activate Bartolomé del Presidio by sacrificing Rendclaw Trow.
2. When Rendclaw Trow 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 Rendclaw Trow.
5. When Rendclaw Trow 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.