The Raven Queen

Flying, Fear
{2}{b}: Choose two target creature cards in your graveyard. Sacrifice a creature. If you do, return
the chosen cards to the battlefield tapped. They
are 1/1 Raven Spirits in addition to their types.
{b}{b}: Search your library for a creature card, put
that card into your graveyard (activate only if you control two or more Ravens).