Borg Queen, Perfection Manifest is a mythic Legendary Artifact Creature — Borg Noble card from Star Trek Commander (TRC), collector number 197.
Artifact creatures you control get +2/+0. When Borg Queen enters, assimilate target creature card from an opponent's graveyard. (Put it onto the battlefield under your control with a +1/+1 counter. It's a Borg artifact creature and loses all other creature types.)