Barrenland

{t}, Pay 1 life: Add {c} to your mana pool.
Whenever you look at one or more cards from the top of your library, if Barrenland is among them, you may reveal it. If you do, put it onto the battlefield.
"Look long, look long and weep. This is the trail that Kozilek leaves in his wake."
-- Muranda, Zendikar Tracker