(You may cast a legendary sorcery only if you control a legendary creature or planeswalker.)

Destroy all artifacts, then Nahiri's Endless Vengeance deals 3 damage to each creature and non-Nahiri planeswalker. If you cast this spell for its madness cost, Nahiri's Endless Vengeance deals X damage to those permanents instead.

Madness {X}{R}{R}