I've got a goblin and a cat deck that I love. The cats don't use cat people though, all low mana cost real cats and uses beastmaster ascension to scale them up. Nothing as satisfying as pay 1 mana to drop a sacred cat or two that's suddenly a 6/6 lifelink with embalm.

I built an all black cult deck that thematically is tons of fun, but needs some work to be more reliable. It's stacked with some dark rituals, and mostly clerics thar make up the "cultists" then there's some sacrifice to search your library/return from graveyard/play from hand, and fi ally some massive OP demon cards. You sac the cultists to call out your demons, its fun but it's not perfect.

The best combo I've managed with it was a swamp, dark ritual and 2 priest of gix on my draw, with put down 2 2/1 creatures on turn one and left me with 3 black mana left to spend on three cards left in my hand.