Sarcophagi of Sleep

When Sarcophagi of Sleep comes into play,
place a creature card form your hand face
down under it.
{4}{t}: Reveal the creature card and put it into
the battlefield. Activate this only if there are
no creatures on the battlefield.
"The plans of the Queen of Darkness are deep. In
times of plenty, she puts a priestess aside; protected
from all harm. A reserve for leaner times."