Batet, Pharaohess

As an additional cost to play this card, sacrifice all
other creatures you control.
Once per turn you may cast any exiled creature.
Its mana cost is now {w}{b}. If you do, create a
Treasure token.
Affection—{w/b}{t}: Batet generates {w}{w}{b} or {b}{b}{w}. Lose 1 Life for each creature you control.
Flashback—Lose 10 Life.