Ominous Ghostlights

At the beginning of your upkeep, mill one
card. Then each of your opponents loses one life and you gain one life.

At the end of your turn, if your graveyard contains cards with total mana value 20 or more, sacrifice Omnious Ghostlights. If you do, create Marit Lage Untamed, a legendary
20/20 black Avatar creature token with
life link and indestructible.