Xenecrix, God of Doom

Indestructible.
Xenecrix, God of Doom isn't a creature unless
there are seven or more creatures among all graveyards.
When Xenecrix, God of Doom enters the battlefield, destroy all nonland permanents with
mana value 4 or more.
{r}{w}{b}{t}, Exile a target card from a graveyard:
Xenecrix, God of Doom deals 3 damage to
any target.