Greenwood Falls

Greenwood Falls enters the battlefield tapped.
{t}: Add {u} to your mana pool.
{3}{u}. {t}, Sacrifice Greenwood Falls: Search
your library for a Pirate card, reveal it, put it
into your hand, then shuffle your library.
Every Pirate in Greenwood has seen the falls at least
once. For it was that river that led them to the sea.