Obsessed Darkdweller

When Obsessed Darkdweller enters the battlefield, search your library for a card, then shuffle your library and put that card on the bottom of it.
Pay 2 life, Sacifice Obsessed Darkdweller: Unveil. (To unveil, reveal the bottom card of your library. If
it's an artifact card, you may put it into your hand. Otherwise, shuffle your library.)