It can completely shut down a threatening attacker that you can't KO, giving you a free turn to set up your own board, power up a counter-attacker, or find a crucial card like Boss's Orders to win the game
Ugin's Labyrinth becomes a standard Sol land if you tuck away an expensive colorless card, and it even gives you access to that card if you want it back at some point
Maybe too open-ended, since it opens the door for infinite combos with Devoted Druid
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(When it dies, 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.) If a card with persist is removed from the graveyard after it dies but before the ability trigger resolves, it won't be returned to the battlefield