Rathi Assassin

{1}{b}{b}{b}, {t}: Destroy target tapped
nonblack creature.
{3},{t}: Search your library for a Mercenary card
with converted mana cost
3 or less and put it onto the battlefield.
Then shuffle your library.
"Up from the stinking dirt she rises
Ghastly pale.
Shapeshifting soon but now she's rigid
stiff and stale". Ghost, "Zombie Queen".