Unthagar of Forgotten Spells

When Unthagar enters the battlefield, search
your library for a instant or sorcery card and put
it into your graveyard.
{3}{t}: Return target card from your exile to your
graveyard. You lose 3 life.
From even the slightest trace of magic, he can learn a
spell. From the power of a leyline, he can see the world.