Batrachic Lithlek

Escape {g/w}{g/w} (Exile this creature. Return it to the battlefield tapped under your control at the beginning of the next end step.)
Islandwalk, Swampwalk, Reach
When Batrachic Lithlek enters the battlefield, you may pay {g/w}{g/w}. If you do, search your library for an Island or Swamp card, reveal that card and put it into your hand. Then shuffle your library.