Nami, Sea Witch

Tribute 2 (As this creature enters the battlefield, an opponent of your choice may place two +1/+1 counters on it.)
When Nami, Sea Witch enters the battlefield, if tribute wasn't paid, Submerge Nami, Sea Witch (Put a -1/-1 counter on this creature. It can't be blocked as long as it has a -1/-1 counter on it.)
If a Planeswalker would enter the battlefield with more than 1 loyalty counter, it enters the battlefield with 1 loyalty counter instead.