Fallen Void

Whenever Fallen Void enters the battlefield, each opponent sacrifices a creature or planeswalker
with the highest mana value among creatures and planeswalkers they control.
If a creature or planeswalker an opponent
controls would be put into a graveyard from anywhere, exile it instead.
Whenever a creature or planeswalker is put into
exile from anywhere, each opponent loses 1 life
and you gain 1 life.