Greirat the Thief

When Greirat the Thief enters the battlefield, you may choose to lose 2 health. If you do, search your library for an artifact card, reveal it, and place it in your hand.
"Well, perhaps I'll go on the prowl. Everyone's
dead or hollowed away anyway, right, so... I
might as well fetch some weapons or treasure for
you. Well, what do you say?"