Sacrifices for these colors are great ways of starting triggers like Blood Artist and more instants/sorceries wil care about Guttersnipes, and each are cool ways to build your Grixis deck in Commander
You can also copy triggered abilities common in Blue like Azorius blink to get another copy of Mulldrifter's ETB or with Karmic Guide or in Bant with Acidic Slime or Timeless Witness or with midrange like Dalek Drone above
This deck is already weak to City in a Bottle, and I really dont feel like having my mana potentially crippled by the card
The Ghoul is better as both halves are zombies
Same cost to play, cheaper to activate, same discard-to-tutor effect, but it lives on a 2/2 body that requires summoning sickness to wear off and can be removed before you get value
Good enough to get the ban hammer while it was in Standard, this sorcery loses a little bit of its appeal in Commander, since the effects can't be split up across different players