Wow, I love this deck. Sacrificing creatures are always fun. I run a token generating deck with sacrificing, and this deck is impressive. There is a card I do recommend looking at,
vindictive vampire. Like
blood artist, everytime a creature of yours dies, you gain a life and your opponent loses one. Some other cards to look at would be
piper of the swarm and
ferocity of the wilds although those might slow this deck down. Ayara first of the locthwain might also work in this deck as well.