Melira + Persist

[Barook]

Melira, Sylvok Outcast :1::g:
Legendary Creature - Human Scout
You can't get poison counters.
Creatures you control can't have -1/-1 counters placed on them.
Creatures your opponents control lose infect.
2/2

How exactly does this card interact with Persist creatures (e.g. Kitchen Finks) and a sac outlet? Does it allow to return the creature into play to go infinite or not?

[cdr]

Persist is a triggered ability. "Persist" means "When this permanent is put into a graveyard from the battlefield, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it."

The "can't have counters placed on" ability already exists on a couple of creatures BTW, so it's not like it's a new interaction.

Placing the -1/-1 counter is part of the effect, so that part will just fail to work. Basically, yes, infinite. Unless the rules get modified.