Thanks goes to JustInBasil and Jake C
Slivers If you thought another tribe should be here (other than humans), you are seriously deluding yourself
If the target creature is an illegal target by the time the spell tries to resolve, the spell will not resolve
It does everything we want in one card: forces a sacrifice and then increases damage being dealt
Even if we eventually need to sacrifice our Judge's Familiar, the fact that it only costs a single mana means we usually get value out of the card, even if it only sits on the battlefield for a few turns
We went through various versions, but here's what we handed off from vision design: Afraid (If an enchantment, Horror, or Nightmare you control entered the battlefield or attacked this turn, all opponents are afraid.) This version interacted not just with enchantments, but a few of the creatures we felt most embodied the genre, Horrors and Nightmares