Walpurgis Nacht

As an additional cost to cast Walpurgis Nacht, sacrifice X Witches. Then, if X is less than 3, sacrifice Walpurgis Nacht.
When Walpurgis Nacht enters the battlefield, all
non-Witches take X damage.
Annihilator X
She will flood the earth with magic,
and take all of humankind into her play.
A moving stage construction.