K, Librarian of Worlds

Indestructible
As long as your devotion to blue and black is less than seven, K, Librarian of Worlds isn’t a creature.
{1}{u}{b}: You may play target card from a graveyard this turn. (You may cast spells and play lands from any graveyard until end of turn.)
Whenever you cast a spell from a graveyard, draw a card and each opponent loses 2 life.