Llorelock, Ill-Gotten Colossus

When Llorelock, Ill-Gotten Colossus enters the
battlefield, you draw X cards and you lose X life,
where X is the number of artifacts you control.
Whenever you cast an artifact spell, you may mill
two cards.
{1}, {t}, Sacrifice a nontoken artifact: Return
target noncreature artifact card from your
graveyard to your hand.