Poseidon, God of the Sea

Indestructible, islandwalk, trample
Undying (When this creature would die, if
it has no +1/+1 counters on in, put a +1/+1
counter on it instead.)
Poseidon, God of the Sea gets +2/+1 for each
Island you control.
When Poseidon, God of the Sea enters the
battlefield, you get {e}{e}{e}.
Pay {e}: Create a 1/3 blue Fish creature token
with "{t}: Add {u}."