Looking at your sideboard I'd recommend removing the
golden guardian. If you add
costly plunder then you can kill it yourself and get some cards off of it, still triggering it's transformation. But you are only running two colors in this deck. That mana use would be more beneficial towards other cards or even another color if you wanted to. Having a JUND PRIMAL DEATH deck would be interesting. That way you could add the red cards like
rile and
sure strike (that would be good since
tetzimoc primal death has deathtouch). You could also add
forerunner of the empire to make it easier to add it to your hand quicker. Since you only need 1 Black mana to use it's effect then it would save you time to get it in your hand faster.
IF you want to keep it B/G would you want to include some more graveyard interactions or maybe more interaction with the other player via card effects?
Journey to eternity would be good to have in this deck. Also the
deathgorge scavenger would be good since it can mess with the enemy's grave, make itself stronger, AND it'll give you life when you need it. Also, even though you have no pirates
march of the drowned will be a good 1 drop that gets back ANY creature.
Pounce will help your
enrage triggers and with spot removal.
Grazing whiptail you may want to add to your sideboard.