Roc, Commander of Feathers

{g}{w}{u}, {t}: Roc, Commander of Feathers
becomes a legendary enchantment attached to
target creature you control with flying. As long
as Roc is an aura he has "Enchanted creature
has hexproof.", "Whenever enchanted creature
deals combat damage to an opponent you may
create a token that's a copy of enchanted
creature.", and "If Roc, Commander of Feathers
would be put into the graveyard from the
battlefield, exile him, then return him to the
battlefield under its owners control."