Finale of the Apocalypse

(You may only cast a legendary sorcery only if you
control a legendary creature or planeswalker.)
Finale of the Apocalypse deals X damage to each creature and player. If X is 10 or more, exile all nonland permanents.
When the outbreak first occurred, no one was safe,
not even the source of the madness herself could
contain such power from the creation rock.