It That Wraps the World

Defender
Other Leviathan, Kraken, Octopus, and Serpent creatures you control get +1/+1.
{6}{u}{u}: Monstrosity 8. (If this creature isn't monstrous, put eight +1/+1 counters on it and it
becomes monstrous.)
As long as It That Wraps the World is monstrous,
it has trample, can attack as though it didn't have defender, and whenever it leaves the battlefield, destroy all nonland permanents except Leviathan, Kraken, Octopus, and Serpent creatures.