Jemutt's Torment

(You may cast a legendary sorcery only if you control a legendary creature or planeswalker.)
Each player separates all permanents they control into three piles and names the piles "A",
"B" and "C". Choose a pile name at random. Each player sacrifices all permanents that aren't in a pile with the chosen name. (Piles can be empty.)
If the prophecy is correct, it will be the end of the world.