Hello there, I was looking over your deck and I see a few areas that may be improved on in this deck;
1) Remove the
avaricious dragon, even though you get that extra card he's not best suited for this kind of deck. If you ran a black/red HELLBENT deck then it would work well with creatures such as
sire of insanity or
cutthroat Il-Dal. Also it would work best if graveyard recursion was a factor but this deck does not appear to be geared towards that play style.
2) Try adding
impact tremors to this deck, most of your creatures have haste and your spells can sac your creatures to make them deal more damage. So why not play an enchantment that makes your opponent lose health just for your creatures
entering the battlefield in the first place? It would speed p the deck and put your opponent on a life clock.
3) Maybe add
fiery impulse,
annihilating fire,
bolt of keranos,
spark jolt and other red cards that burn and let you scry. This way you can
deal damage AND work through your library faster.
I hope that these suggestions were helpful for you.