Core of Darkbane

{2}, {t}, Sacrifice Core of Darkbane: Search your
library for a legendary dragon card or a basic
land card, reveal it, put it into your hand, shuffle
your library.
The core was then hooked up to the ship to supply it
power. The core glowed a deep red and pulsed with
what seemed like a heartbeat. After a moment it gave
out a loud scream. The researchers stood back, as the
core had begun to bleed.