Annihilate The Sinful

(You may cast a legendary sorcery only if you control
a legendary creature or planeswalker.)
Annihilate The Sinful deals 10 damage to all creatures and planeswalkers. Each player loses
life equal to the number of creatures and planeswalkers destroyed this way under their
control.
Once the land is scoured clean, then only the mightiest
and purest will remain.