Lesser Masticore does not have a -1/-1 counter on it.
Steps
Activate Bartolomé del Presidio by sacrificing Lesser Masticore.
When Lesser Masticore dies, its persist ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it due to Curator Beastie.
Resolve the Bartolomé del Presidio ability, putting a +1/+1 counter on it.
Repeat.
Results
Infinite LTB.
Infinite ETB.
Infinite sacrifice triggers.
Infinite death triggers.
Infinite +1/+1 counters on Bartolomé del Presidio.