Pilkaron, Pinnacle of Storms

When Pilkaron, Pinnacle of Storms enters the battlefield, if it was cast from your hand, it
enters with a wave counter on it.
Whenever Pilkaron, Pinnacle of Storms would
die and it has a wave counter on it, return all creatures to their owners' hands except for
Krakens, Leviathans, Octopuses, and Serpents.
Then return Pilkaron, Pinnacle of Storms to the battlefield.