The Flight of Nightmares

-: Can only be attacked by creatures with Flying or Reach and is Hexproof. Nightmare Angels gain Vigilance. Uses -9 at 11+
0: Put a Nightmare Angel into play and give it Haste. Flight of Nightmares gets +1 Loyalty for each Nightmare Angel in play.
-9: Reveal cards from Emrakul's library until a Legendary is revealed and play it. Shuffle the rest into Emrakul's Library