Force of Life and of Death

(You may only cast a legendary sorcery only if you control a legendary creature or a planeswalker.)
(Spend only white or black mana to cast this spell.)
Destroy all nonlegendary nonland permanents. If you spent more {w} to cast Force of Life and of Death, you gain 2 life for each card put into your graveyard this turn. If you spent more {b} to cast it, each opponent loses 1 life for each card put into their graveyard this turn."