Librarian of Nyx

Hexproof, Shroud
{t}{p/b}{p/b}, Steal non-creature permanent that an opponent controls
{p/b}{x}, Search library for target creature or artifact
with mana cost equal to that of mana or life used
for ability. Cast that card or add it to your hand.
If target is a creature, it now has lifelink.
"When the world is coated in darkness, only one can navigate the void."