Personally i like the feel of the deck, it gives a more aggressive take on Abzan's token production. But i do have some slight adjustments that might make it run a little better.
When I was running the simulator I saw that I wasn't getting the green mana I needed for most of the cards. You might wither want to lessen the black and add more green or start using cards that cost black and not as much green. Some ideas for black cards to add would be
dutiful return,
grim contest ( to utilize your strong creatures without having to swing), and if you feel like adding
voracious null you can use his effect to sacrifice
servant of the scale and spread those +1/+1 counters all over your board.
Bone splinters would also help if you chose to do a similar tactic.
As far as +1/+1 counter production you've got that pretty much taken care of. If you add
retreat to kazandu you'll get a counter every time a land you control enters play,
earthen arms is two +1/+1 counters easy.
Infuse with the elements can make a lot of +1/+1 counters for you quickly if you use multiple colors for it. This would help greatly for an
undergrowth champion or
woodland wanderer (if you ever decide to get them). Also if you use
savage punch,
awaken the bear and
hunt the weak it will be a good way to utilize your creatures with the outlast effect. Another good green creature would be
murasa ranger because its own effect gives it +1/+1 counters (which can be doubled by your corpesjack menace).
Reclaiming vines seems like a high cost card but it gives you three targets to choose from so it's definitely main or side board worthy.
That way they can tap themselves and still be able to eliminate creatures. Just some food for thought on this deck. I hope the ideas help.