Hakhi, Hoarder of Lost

As long as you have 5 or more artifacts, this card has Flying. Whenever an artifact enters the battlefield, you may pay {4} and take control of that artifact. Whenever an artifact enters the battlefield under your control, draw a card. Once per turn, if you control eight or more artifacts, you may sacrifice any number of artifacts you control to give Hakhi, Hoa
rder of Lost +2/-1.