Hello.
In this kind of deck, vampirete styleto and morning star are not that great. If you can afford upgrades, some shards of gratitude will help a lot. Also one eternity is enought, I doubt you can take advantatge in a 30 cards deck of having two. Also splitting in some creature can help, like Oty, mind flasher ,flying/elite queen, fallen druid, to deal with a lot of differents situations. Maybe one hourglasse also can help.
I am only saying some suggestions, you can try it and see if that works better or not.
Have you ever played against a deck in t50 that is based in this theme?(I don't remember the owner), with gravity mark for Oty/Pulverizer. This kind of deck works well against T-50, with a great winning % but it have the drawback that it is prety slow compared to other kinds of decks.