Yes I realize this is technically necromancy even though its only 3rd from the top, but Nyxathid might be a good choice for this deck...
its 3 for a 7/7 that gets -1/-1 in a chosen opponents hand, by turn 2/3 youd likely be getting a 4/4 or bigger because of the amount of discard you have..
like a turn one dark ritual, duress, ravenous rats, and a turn two thoughtseize would be a great set up for this creature