Relentless Kraken

Tribute 1, Persist (As this creature enters the battlefield, an opponent of your choice may put a +1/+1 counter on it. When this creature 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.)
When Relentless Kraken enters the battlefield, if tribute wasn't paid, you may return all creatures target player controls to their owner's hand.