Masyaf

{t}, Pay 1 life, Sacrifice Masyaf: Search your library for a Mountain or Plains card and put it onto the battlefield. Then shuffle your library.
"An imposing castle of many turrets, surrounded by shimmering rivers, it presided over the bustling village below, the settlement a high point within the Orontes Valley. An oasis of peace. A paradise."
- Niccolo Polo describing Masyaf