Ghastcloak

Bestow {b}{g/w}{w/u}(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 one.)
Enchanted creature and Ghastcloak have flying, get -2/-0, and have "whenever this permanent doesn't untap, you may drain 1." (To drain 1, target opponent loses 1 life, and you gain 1 life.)