Your favourite Black creature (Goodstuff)

Hi,

I m looking for stuff to put in a "goodstuff" deck (for casual), so I m looking for cards that you like and just could put in every black deck you have.

So nothing that is only great in tribal or certain circumstances but just a good card.

For me it d be [[Shakedown Heavy]] for example; for just 3 mana he gives you a FAT blocker, that draws you cards reliably and early and is a great target for stuff like Disciple of Bolas.

TLDR; What is your favourite monoblack-legal creature that you d like to put in the 99 of every deck, as it is great without anythin else (casual, at best sth that fits in either card advantage, interaction or wipe)

THX