The goal of this deck is to get tons of small goblins, kill them off with a board wiper and a blood artist out, or even better, sacrifice them with a bloodflow connoisseur. I took Vexing devil for early game damage and a possible blood artist trigger, Vampire nighthawk to keep the game going long enough and to remove big threatening creatures during the game. Flames of the Firebrand for multi-creature removal to maximize artist triggers. Dreadbore to handle planeswalkers and other threats. The rest of the cards are self-explanatory.Cards I'm considering:

Falkenrath Aristocrat. I tested running a set of these in place of the connoisseurs, but I don't love it since I can't stack counters on it. I get that it's flying, but having a huge creature is better than a 4/1 flyer that can be tragic slipped without even a morbid trigger. I feel I could run 2 of these and 2 connoisseurs but I'm not positive.

Underworld Connections. Considering this for ensuring a Blood Artist pull, but I don't like the mana cost being 3, with 2 of it being specifically black. I don't really mind the loss of life since the nighthawks and artist triggers will keep me up.

Brimstone Volley. Good removal and damage, the morbid trigger is pretty much a given with this deck. I don't see why not. I could drop Flames of the Firebrand for it.

Rolling Temblor. Good board wiper, might swap for magmaquake or sideboard for zombie hate.

I also need help constructing a sideboard, I don't really know how to start with that. Leave your thoughts in a comment, thanks in advance!