Demon of Deep Sleep

Bestow {3}{b}{b} (If you cast this card for its bestow
cost, it's an Aura spell with enchant creature. It
becomes a creature again if it's not attached to a
creature.)
Enchanted creature has "When this creature is
tapped, create a 6/6 black Demon creature token
with trample. Exile that token when this creature
is untapped."
A cruelty to which even angels shrink.