Lich of the Undercity

Whenever you gain life, for each 1 life you gain, you may put that many cards from the top
of your library into your graveyard.
{2}{b}{b}, {t}, Sacrifice Lich of the Undercity: Put target creature card from your graveyard onto the battlefield. It gains haste.
Powerful lich lords live in the undercity of Ravnica, practicing their cruel and inhuman rituals.