Behold the End

(You may cast a legendary sorcery only if you control a legendary creature or planeswalker.)
Exile all nonblack creatures.
"Oh God, please let me forget. I saw Him, I saw
his throne and his Void. I've seen it all, beheld
the end, and I fear one day you all will too."
--Bethet, Farseer of Drakthur