Why Ashmouth Hound ? Unless there's some weird interaction i don't see, it absolutely sucks.
I love slumbering dragon! I tried to put something like this together for standard but it never worked out, especially with Vapor Snag + Snapcaster Mage being so common in standard. Nevertheless I feel as though your deck relies too much on one card. Might I suggest adding something like Blood Reckoning to make it so you can make your opponents lose without needing to attack with Slumbering Dragon . I realize you will have to add some black, but Forbidden Orchard Should make that an easier task
there is one other thing I can use to win its quite an odd win condition, if you have thunderstaff out you can continuously attack someone with acorn catapult until they die, however I think blood reckoning is a really good Idea I'll find something to swap out for it.
hehe, Thunderstaff is just trolling your opponent when they get those little 1/1 from Hunted Phantasm and such. That is pretty cool. Seems like a great casual deck. Curse of the Nightly Hunt with the little tokens and Slumbering Dragon is a pretty awesome combo. +1