Traveler of the Unfathomable

When this creature enters the battlefield, reveal
five cards at random from the cube and put one
into your hand. Then put the rest back into the
cube.
{2}{u}{g}, {t}: Reveal five cards at random from the
cube and put one into your hand. Then put the
rest back into the cube.
Nobody believes his stories. How could we?
The things he spoke of boggled the mind!
Until he brought one back...