Ethereal Valkyrie [KHC] 16

Creature — Spirit Angel

Flying
Whenever Ethereal Valkyrie enters the battlefield or attacks, draw a card, then exile a card from your hand face down. It becomes foretold. Its foretell cost is its mana cost reduced by (2). (On a later turn, you may cast it for its foretell cost, even if this creature has left the battlefield.)