Even aside from whatever value you're getting from the actual enchantment (which could be massive - think Hallowed Haunting or Mirari's Wake), you'll also be getting a 3/3 with menace
Even if youre not built to maximize Sephiroth, its still great in any black deck and worth picking highly
In my experience, your creatures die to a wipe or they take 13 damage with a Blasphemous Act, and no coroner is going to look at the charred husk of what used to be your commander and say "I think the cause of death was Minestrone." Making a creature unblockable is good, giving it Shroud is NOT always good because sometimes you like the idea of having an unblockable creature that can have more equipment and auras go on it
When Pashalik Mons or another Goblin dies, you get to deal one damage to a creature or a player, letting your little Goblins get one last ping in before dying
When you do, cast it for its madness cost or put it into your graveyard.) Lifelink Other Vampires you control get +1/+1