The Council Of Shadows

Indestructible, Lifelink
When this card enters the battlefield, exile every
card from every graveyard, then create X 2/2
black phantoms with lifelink named Leigon of Darkness, where X is the number of cards in exile, then return all exiled card to their graveyards.
Sacrifice 5 creatures: Exile this card. return it to
the battlefield at the beginning of your next upkeep.
The phantom leaders of Shadeclan, lead themselves by the Last Shadow.