Neryx, Bringer of Terror

Double Strike, Trample
{r}{r}{r}, Discard a Mountain: Put Neryx,
Bringer of Terror on to the battlefield from your
hand. It gains haste until end of turn. Exile it at
the beginning of the next end step.
Whenever you cast Neryx, Bringer of Terror,
Neryx, Bringer of Terror deals 3 damage to
each opponent and each creature and
planeswalker they control.