Ogdru Jahad

Indestructible.
As long as your Devotion to {b} is less than 7 Ogdru Jahad isn't a creature.
Activated abilities may only be activated if Ogdru Jahad is a creature.
{5}{b} Exile Ogdru Jahad
{7}{b}{b} Return Ogdru Jahad from exile, destroy all creatures on the battlefield.