Horn of the Mark (LTR-BF)

Legendary Artifact

Whenever two or more creatures you control attack a player, look at the top five cards of your library. You may reveal a creature card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.

"He that blows this horn shall set fear in the hearts of his enemies and joy in the hearts of his friends." —Éowyn