Yaratnam, Deep Sea Mage

0: Return Yaratnam to your hand and draw a card. Put a card in your hand on the bottom of your library.
-2: Put cards from the bottom of your library into your graveyard until you hit a land. You may put that land into play.
-4: Reveal the bottom card of your library. If its converted mana cost is less than the amount of cards in your hand, you may cast it for free.