Demi-fiend, The Awaken

Every creature you control is a demon in addition
to its other types.
Hades Blast- {3}: Until the end of turn, switch
the power and toughness of Demi-fiend,
The Awaken.
Creatures in your graveyard have flashback equal
to it's coverted mana cost plus {4}, use only as
a sorcery.