The Entity, Nightmare Master

Other Nightmares and Horrors get +1/+1.
{b}{b}{b}, Pay 3 life: Put target creature card from a graveyard onto the battlefield under your control. It becomes a black Nightmare in addition to its other creature types.
When The Entity, Nightmare Master leaves
the battlefield, exile all Nightmares.
"Freddy, as in me?"
"It isn't you, He's scarier. He's...."
"Darker. More.....Evil?"