Sarevok, Deadly Usurper
{3}{B}{B}Legendary Creature — Human Knight
When this creature specializes, seek a creature card and put it into your graveyard, then conjure two duplicates of it into your graveyard. At the beginning of combat on your turn, target creature you control gets +X/+0 until end of turn, where X is the number of creature cards in your graveyard.