Azur Darkness bringer

Haste, Doublestrike.
When Azur Darkness Bringer comes into play tap all white creature cards and all white enchantment effect are inactive until end of turn.
{w}{w}{w}{w}{w}{w}, {t}: Destroy all white creatures, or Destroy all white mana producing lands
Azur Darkness Bringer cannot untap until you pay {w}{w}{w}{w}{w}..
"You where the light, I am the Darkness, I am the night".