The Hollow Legion

When The Hollow Legion enters the battlefield, sacrifice all nonlegendary creatures you control.
At the end of your main phase, create X 3/3 red
and black Demon Horrors with haste and wither,
where X is the number of creature cards you own
in your graveyard and in exile.
"The Hollowed are not empty. They are full of fury, a
twisted rage born of the resent of a forgotten god.
Behold, and despair."