Ruinroost Matriarch

Flying
Whenever Ruinroost Matriarch enters the
battlefield or attacks, target player mills two
cards. If the player mills at least one creature
card this way, create a 1/1 black Harpy creature
token with flying.
"Her crown might be feathers rather than gold, but she
sits on a throne of bones. Choose your words carefully."
—Cleanfeather, diplomat