Poseidon, Lord of the Sea

Indestructible, Olympian
When Poseidon enters, tap X creatures you
don't control, where X is the number of Islands you control. Put a stun counter on those creatures.
While you control Zeus, King of the Gods, Islands you control are 5/5 Elemental creatures with flying, first strike, trample, haste, and hexproof. They're still lands.