Tidal Lurker

Dive: You may pay {u}{u}, this creature enters the battlefield face down as a 2/2 blue artifact creature.
Pay {4} to flip this card, you can use this ability as if
it had flash. If this creature is face up on the battlefield, you may pay {u}{u} to flip it face down.

Whenever Tidal Lurker flips face up, you may
search your library for an Island and play it onto the battlefield.