Curse of Predation

• WWizards of the Coast2013-10-17
  Official Ruling
  Curse is an enchantment type, not a creature type (or any other kind of subtype).
• WWizards of the Coast2013-10-17
  Official Ruling
  The ability won’t trigger when a creature attacks a planeswalker controlled by the enchanted player.
• WWizards of the Coast2013-10-17
  Official Ruling
  Each of the Curses can be attached to any player, including the player who cast the Curse.
• WWizards of the Coast2013-10-17
  Official Ruling
  A Curse spell targets the player it will enchant like any other Aura spell, and a Curse stays on the battlefield like any other Aura. If the enchanted player gains protection from the Curse’s color (or any other characteristic the Curse has), the Curse will be put into its owner’s graveyard.
• WWizards of the Coast2013-10-17
  Official Ruling
  The Curse subtype has no inherent rules meaning, but two cards in the Innistrad set (Bitterheart Witch and Witchbane Orb) refer to Curses.

Rulings via Scryfall