Maddening Darkness

(You may cast a legendary sorcery only if you control
a legendary creature or planeswalker.)
Exile up to X creatures an opponent controls. At
the beginning of that opponent's next end step,
return the exiled creatures to the battlefield
under their owner's control with a -1/-1 counter
on them.
---{dash}{dash}{dash}{dash}{dash}{dash}{dash}{dash}{dash}{dash}{dash}{dash}{dash}{dash}{dash}{dash}{dash}{dash}{dash}{dash}{dash}{dash}{dash}{dash}{dash}{dash}{dash}{dash}{dash}{dash}{