So far I'm finding out a couple things the very hard way, lol. For one I don't see how you are not running gates here.
I think you need more creatures for sure, I'm running more than you and still feel I am lacking enough creatures. With both sets of main creatures being beasts I think
Advocate of the Beast is working out really well so far.
I also think, since we really never know how many Plains we may get out, that
Nimbus Wings is a cheaper alternative to
Armored Ascension. I see you run them but what I like instead at that 4-spot are the
Marked by Honor (I run 2). Again, with the limited number of creatures (but usually very large) having Vigilance is awesome. I also run 2x
Burning Anger which works really well with Vigilance and big creatures.
I know this doesn't necessarily fit the whole theme, but seriously...
Baneslayer Angel and
Inferno Titan are just way too awesome to pass up here and as I can see from your SS (and from my little experience so far), this deck isn't a fast T5 kill type of deck so they make excellent options in a slower build like this.
I also feel that
Lightning Talons isn't quite needed as the creatures tend to get really big and the FS isn't that big of a deal when you can soak up the damage most of the time anyhow. I certainly don't think they are bad but something has to be cut here and there.
I'm not a big fan of
Elvish Pioneer here either. I use 3x
Wall of Omen instead which helps defend while I get my big creatures going and gives me card draw. Pioneer can be a dead draw later on as well unless I am getting mana flooded (in which case things are not looking good anyway, lol). At the very least I would use
Elvish Visionary over Pioneer if you want something you can throw an aura on and attack.
Vengevine also isn't the best fit here imo. He will pretty much never have his GY ability activate in this style of a build and while 4/3 Haste is still nothing to sneeze at, Baneslayer and/or Titan are better options for what they bring to the table while the 4-slot is almost always going to be better used to throw down our superstar in this build (Huntbeast).
These are just my thoughts so far and I have played a lot less games than you devil. I'll post a build soon when I feel I have got a good enough build going. Although from what I have mentioned it is nearly fleshed out anyway, lol. I'm gonna test out
Triumph of Ferocity here too as the beefed up beasts should always get a draw with this. I think it might be a nice 1-of. What do you guys think?