I noticed one thing right away. You have a lot of expensive creatures. While creatures with high mana cost can be powerful and fun to play, you need a good core of meat and potatoes creatures that fit the build of your deck and also cost one or two mana each. I really Like Duty Bound Dead... and knight of infamy for black cards that you have... and I like Rakdos Shred-Freaks.... you have some Goblin Arsonists and Somberwald Vigalante... they might be solid turn one drops, and can GOblin Arsonist can compliment with Bone Spinters for a cheap damage and murder.
you actually have a pretty good spread of creatures, instants/sorceries... etc. Maybe you could stand to drop a couple of lands if you play lower mana cost items... 24 is generally good, I use 22 in most of my decks especially if I have some mana that can produce multiple colors.
you have a pretty good start and can really build on it... as you play you'll have a better idea of what you want your deck to do. Find a focus and expand on it. Remove cards that don't fit the bill... don't be afraid to take cards out.
