The Avacyn Restored spoilers continue with a new demon:
Wow! Amazing! And then... reality set in. The most I think about it the most the drawback just feels like it's too big a price. Don't get me wrong; Demonlord of Ashmouth is a very aggressively costed card and a huge, resilient beater all on its own and yet... it fails so hard against bounce and it's basically card disadvantage unless you're playing zombies.
Play zombies. I don't know what else there is to say. Play zombies and hope to have a Gravecrawler in play by the time you want to cast the demon and then it'll be totally worth it.