Shelldock Karst
Land (Rare)

Tap, Pay 1 life, Sacrifice Shelldock Karst: Search your library for a Forest or Island card and put it onto the battlefield, then shuffle your library.

GU: Shelldock Karst becomes a 2/1 blue and green Illusion Crab creature until end of turn. It's still a land.

Mark Deschamps