Xendros, Magic Merchant

When Xendros, Magic Merchant enters the battlefield look at the top {x} cards of your library
and you may reveal an artifact, enchantment,
instant, or sorcery card from among them and
put it into your hand. Put the other cards back
in any order.
"What I have, I have for sale, and much of it I made myself." -Xendros' favorite sales pitch.