The Ouroboros

Deathtouch, trample, searchcast UUBBGG
When The Ouroboros enters the battlefield, you get an emblem with "{g}: Search your library for a land card, reveal it, and put it into your hand. Then shuffle your library. Activate this ability as a sorcery, and only once each turn."
When The Ouroboros goes to your graveyard from anywhere, shuffle your graveyard into your library.