Medella, Vision of Devastation

Devoid (This card has no color.)
Deathtouch.
Annihilator 1 (Whenever this creature attacks, defending player sacrifices one permanent.)
If you have 10 or more creature cards in your graveyard, Medella, Vision of Devastation has Annihilator 2 instead.

First of her kind, pray she's the last.