Griphook

When Griphook enters the battlefield, look at the
top ten cards of your library. You may reveal an
artifact card from among them and put it into
your hand. Put the rest on the bottom of your
library in any order.
If you control a Death Eater, you may sacrifice
Griphook, if you do, return target artifact card
from your graveyard to your hand.
Thief, you have been warned, beware