Aldikar, Premonition of Fire

Flying, haste
At the beginning of your end step, if Aldikar, Premonition of Fire is untapped, target opponent loses 2 life.
When Aldikar, Premonition of Fire exits the battlefield, you may sacrifice an artifact you control. If you do, return Aldikar, Premonition
of Fire from the graveyard to the battlefield tapped.