The Harrowing

Return the 6 strongest creatures in your
graveyard to the battlefield. They enter with
ephemeral. (Creatures with ephemeral do not enter
with summoning sickness. However, they will
self-destruct at the beginning of the end step.)

On certain nights, a tide of hungry spirits swells the
Black Mist. It carries them across the seas to prey on
the living, and feed the growing darkness with foul
new unlife.