Nemzeret, Endless Assassin

When Nemzeret, Endless Assassin is Exiled,
return it to the Battlefield under your control
at the beginning of the next end step.
When Nemzeret, Endless Assassin would enter
the Graveyard, Exile it instead.
When Nemzeret, Endless Assassin enters the
Battlefield, every player sacrifices a Legendary
permanent.
"You do not know the endless pain of existence." -Nemzeret, Endless Assassin.