Expensive, but yes would take the place of Emancipation Angel.
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Yea, I played a version of this deck online with Immerwolves and Pyreheart Wolves. It was good, but I feel this is better. The reason is, everything is a threat. Young wolf may seem lame, but he is cannon fodder for the Ulvenwald Tracker, and helps me trigger Hunger of the Howlpack whenever I want. A turn 2 mayor has perfect synergy with turn 3 Wolfir Avenger. And Wandering Wolf with a Hunger of the Howlpack on him is a win condition by himself. Howlgeist is nice, but when I play tested, I didn't like him as much as Acidic Slime, just because of the utility. However, I may switch Prey Upon for Immerwolf, since Abundant Growth is there. Hard to say. I think Travel Prep was supposed to be in here as well, since that was the whole reason for Abundant Growth. That and sideboard. Thanks for comments though. Appreciate it.
I will attempt to provide some input here, hopefully will be helpful. I like the idea, and I actually play Chalice of Life in a mono white deck that I have. I do think you should probably up the lands to around 22 or so, that will give you some consistency on getting a turn 3 land drop. Other than that, I don't know how good Dungrove is in this deck, because with the Sunpetals, Rootbound, and Hinterlands, you will probably only have 1 or 2 forests out. If you up the forests and drop some the dual lands, he could be that big hexproof closer you are looking for. I don't see anything requiring the other colors for the dual lands, but maybe you had something in mind. If you are trying to stay mono-green, Gnaw to the Bone is a nice card, but I think by splashing in some white, maybe with some Avacyn's Pilgrims, you can add some nice life gain, with cards like Moment of Heroism and Nearhearth Pilgrims. Another solution to your big hexproof creature problem could be running Ranger's Guile. This helps get around spot removal, or that pesky Act of Treason. Swiftfoot boots could do it too. Lastly, Craterhoof Behemoth and Wolvir Silverheart are great big closers for Green. Hopefully I have been helpful.