Victimize would be a good card to add to this deck because you want to resurrect your own creatures and not necessarily your opponent's as well. If you add cards such as
disentomb, and creatures that such as
crypt ghast that multiply your mana output (because a lot of your creatures have high costs). Besides that try playing less with the cards that make you mill yourself and rather play with low drop creatures that make your opponent discard like
drainpipe vermin,
black cat, and
slate street ruffian. I say this because with all the high drop cards you have the last thing you want your opponent to do is to
cancel or
negate one of your plays and have you sitting without any mana. Also this way you can get multiple creatures in the graveyard while maintaining a board presence and contributing to the overall goal of the deck. What do you think about this?