With all the sac you might also want to put in a couple of enchantments that work to your benefit like Grave Pact or Dictate of Erebos

clown_baby this is a Tiny Leader deck. It's a variation of commander that has a deck of 49 cards + a commander (Tiny Leader) and all cards cost 3 mana or less.

If you're worried about not having a low enough mana curve, I found the following zombies: Festering Mummy, Black Cat, Blood Scrivener, Boneknitter, Null Champion, Plaguebearer

I'd consider swapping in an Ammit Eternal, Blighted Bat and a Tattered Mummy; they keep with the zombie theme and either increase power (Ammit) or even out your CMC Curve on creatures. I would also consider removing the Hymn as it is kind of out of place, swap in a Fatal Push and find room for a Murder. Dash Hopes would be a reasonable card to consider as it forces life loss if your opponent doesn't want to be countered. Trespasser's Curse would be a good choice to find room for as well as you know your opponent is going to play creatures.