Embrace of the Everdark

Enchant creature.
Enchanted creature gets +1/+0 and flying, and is
a Harpy in addition to its other types, and
whenever it would die, return it to the
battlefield tapped under your control.
At the beginning of your end step, if an opponent
milled six or more cards this turn, return
Embrace of the Everdark from your graveyard
to your hand.