Zarkhan Kruul

Indestructible.
When Zarkhan Kruul enters the battlefield
return all Disciple of Kruul creature cards from
your graveyard to the battlefield.
When a Disciple of Kruul creature card dies, you
may pay {b}{b}. If you do, return target Dicsciple
of Kruul creature card to the battlefield.
"Behold, darkness given form"