I would add a Maiden of Macabre or two. Everytime it destroys a monster, you place a Spell Counter on it. Then it gains 200 ATK for each Spell Counter on it. Plus, it's a Lv. 4 Dark type Spellcaster with 1700 ATK and 0 DEF. I would also add a Dark Mambele. If you control 3 Dark type monsters, you can banish 1 card on the field. It's a normal Spell card. Snipe Hunter's not a bad card, either. Lv. 4, Dark type Fiend, 1500 ATK and 600 DEF, and it can destroy a card you target when it is summoned if you roll a 2, 3, 4, or 5 on a dice roll as long as you discard one card. Anyway, it's a good deck and I will be using some cards from it. I also really like The Beginning of the End.
Good luck getting those cards together!