Look workable, but unfocused. You've got a sort of red-black Madness plan there, but you've also got cards like Wall of Razors and Triskaidekaphobia that don't really fit that plan at all. If I were you I'd probably go all-in on the Madness theme for extra synergy.
If that doesn't suit you, maybe standard red-black aggro will?
All this, and as an FYI, you can't play more than 4 of any one card, except basic lands, so you'll have to drop 4 of your
Smoldering Marsh.
You have a couple of cards that are pushing your deck out of standard and into Legacy\Vintage, though most of your cards are from SOI. If you drop the old cards, and stick with cards available in Standard you have the core of a pretty good B/R Vampire Madness deck.
You could drop your none Vampire Creatures and add a couple of
Stensia Masquerade, and some other vampires (there are quite a few good ones other than just the SOI ones). Regardless of what you want to do, I'd drop
Slayer's Plate, since you only have a 4.5 Humans (werewolves aren't humans on their night side), and you only get the full benefit when it is on a human.