Nahiri, The Fallen Angel

Flying, Deathtouch, Liflink, Vigilance, Indestructible
You may only cast Nahiri, The Fallen Angel from
your graveyard or exile, by sacrificing 2 creatures, milling 2 cards, and paying 2 life, in addition to
its mana cost.
Whenever Nahiri, The Fallen Angel deals damage
to a player; Surveil 1, and proliferate.