Mikaeus, the Unhallowed + Kithkin Spellduster + Bartolomé del Presidio

Mikaeus, the Unhallowed

Kithkin Spellduster

Bartolomé del Presidio

How it works

1. Activate Bartolomé del Presidio by sacrificing Kithkin Spellduster.
2. When Kithkin Spellduster 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 Kithkin Spellduster.
5. When Kithkin Spellduster 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.