The point of the deck: First turn 4/4 with a second turn Heavy Hitter Game Ender. Most people don't see it coming and they are too worried about that Horror than what's coming next...
I.E.
Turn 1: Dark Ritual = Hidden Horror 4/4
Turn 2: Animate Dead for a Heavy Hitter
Turn 3: Necromancer's, Rats or Hounds, etc
Turn 4: Body Snatcher or Sorcery out a Heavy Hitter
Turn 5 & 6:?
... GAME OVER!

If you can survive turn 3 & 4 the game is usually over shortly after that

I only ever run into issues with counters going off -perhaps Duress vs. Ostracize? I.E. who cares what is in their hand? We're going to be dropping something horrible real fast. -Elves and Goblins were no match. 

Snatcher and Hounds should tide past the early game if needed.
The only threats I've ever faced is fast weenie blue spells and instants, and white lifegiving/protection. Usually by the time they catch up -or catch ON- the game is over though.

This is a FUN deck to play- you don't get your tutors and you have to fully commit to getting thumped around turn 4 if you don't pull a combo -it's light on mana but nothing except the snatchers cost more than 3- !!!.

Maybe if more mid game is needed...
Ghouls Feast
Soulshriek
Mind Slash
Tendrils of Despair

I'm sure there's better heavy hitters now- (I tried to keep 12 in the deck no matter what- I wanted 2-3 in my hand to discard whenever possible)  these were just the best I had at the time; the Strossus is a nightmare without a token generator of some kind- but you only need it for 2 turns- just grab something else to finish the game!