Darkeater Midir

Flying

Abyssal Breath— When Darkeater Midir attacks it gains +X/+0 until the end of turn, where X is the greatest power among creatures in your graveyard.

Fallen Ancient— Pay 2 life, and mill two cards.

"Midir, descendant of the Archdragons, was raised by the gods, and owing to his immortality was given a duty to eternally battle the dark, a duty that he would never forget, even after the gods perished." — Shira