Startled Awake [Shadows over Innistrad]

Target opponent puts the top thirteen cards of their library into their graveyard. {3}{U}{U}: Put Startled Awake from your graveyard onto the battlefield transformed. Activate this ability only any time you could cast a sorcery.

Skulk (This creature can't be blocked by creatures with greater power.) When Persistent Nightmare deals combat damage to a player, return it to its owner's hand.