Sensible Ghoul

Flying, deathtouch
When Sensible Ghoul enters the
battlefield create a 0/1 green human creature
token with "When this creature dies, transform
target creature you control named "Sensible
Ghoul", then you lose 4 life"
Once a millenia, a newborn demon is exposed to a
newborn human cursed with eternal youth, the demon
grows attached, and is sacrificed when it turns 100
years old