This is a pretty good deck so far. I see the purpose behind this deck but there are some areas that you can improve upon;
1) Even though the deck is mono black it helps to have a geared focus with this deck. A good place to start is to use
underworld dreams to its fullest. Using cards like
damnable pact and
sign in blood to make your opponent draw a whole bunch of cards will put your opponent in a tight spot with the reduced hand size. Also a creature like
sangromancer, would help using your opponent's misfortunes to your advantage. All you'd need would be one
mind rot and could empty a person's hand in one turn.
2) next try to use more updated cards, some cards that do more than one thing. Say for instance;
black knight instead of
order of the ebon hand,
wring flesh instead of
eye gouge,
crippling blight instead of
weakness. Think of cards in that manner, cards that have similar attributes but are more effective towards your deck's goal. Also
waste not could be an all purpose card for being used against a person you're making discard.
mind rot,
drainpipe vermin, and
black cat would be good investments to have as well.
3) Lastly try using the mono black theme to your advantage. You have one of the strongest colors as far as control and destruction goes. If you can get enough of your hand limiting creatures and use your black mana for cards like
corrupt,
maw of the mire, and tendrils or corruption. Let me know what you think about the ideas ok?