The Horn of Jurgen Windcaller

When The Horn of Jurgen Windcaller enter the battlefield, put an Instant — Thu'um card from
your library in your hand.
Then shuffle your library.
{t}:{3} put an Instant - Thu'um card from your
exil to your library
"My disciples still follow the difficult path,
the Way of the Voice is neither wide, nor easy."
-Jurgen Windcaller