Final Cataclysm

(You may cast a legendary sorcery only if you control
a legendary creature or planeswalker.)
As an additional cost to cast Final Cataclysm, pay
twice X life.
All nonlegendary creatures get -X/-X until end
of turn.
"I will burn your armies, raze your cities and, when
you have lost all hope, I will crush you like the insects
you are." —Sakku-oni