3 cards that you may want to consider are Chronicler of Heroes, Reap What Is Sown, and High Sentinels of Arashin. Chronicler of Heroes almost always draws a card in this deck, providing a source of card draw on a decently costed body to keep the engine going. High Sentinels of Arashin is a good top end that enables counters and benefits off the other counter enablers. Finally,Reap What Is Sown is very good if you are trying to go wide with counters for the counter lords and Avatar of the Resolute. Also if it fits your budget, Collected Company can be absurd in this deck.

I'm trying to not go older than Tarkir block, since Theros only has a couple months left. I thought about High Sentinels of Arashin, but this deck tends to get out a few powerful creatures rather than a lot of creatures, and I didn't think it would end up being worth a slot. I will play with it though. Collected Company and I have a love/hate relationship. I feel like it SHOULD be awesome in this deck, but too often I have dropped Scale Blessing and/or Hardened Scales to the bottom of the deck with it and not gotten any or only one creature out of it. It always gets suggested though lol.

Take a look at Hangarback Walker. Very hard to deal with. Also, Citadel Siege could be a good addition. Solidarity of Heroes. Doubling counters and activating heroic? Seems good.

I have Citadel Siege in my maybeboard because I'm not sure about another enchantment, but I'll do more testing. Solidarity of Heroes would be awesome I think. I don't have any heroic in here, but doubling counters could be really powerful in this deck. I am also very intrigued by Hangarback Walker and I'll test him out. Could be very powerful.

what about Tuskguard Captain?

giving creatures with counters trample

So Solidarity of Heroes could be a good replacement for Feat of Resistance, and I'm still testing that. Hangarback Walker is great in this deck, but quickly takes it out of budget. I put them back into the maybeboard, but I think I may pick 4 up for this deck. Tuskguard Captain I thought of doing when I originally put this together, but I didn't want to much Outlast, and I think I like flying and lifelink more personally.

You should put servant scale in your deck. I think your deck will play effectively with it.

Snare15 - Servant of the Scale is already in the deck. Did you mean something different?

Den Protector?

I've been testing a similar build using Hangarback Walker and Scourge of Skola Vale. The Scourge lets you pop the Walker at instant speed and pumps himself with trample. Life's Legacy has performed well also. Card draw in g/w? Yes please

Fungreatmario - I thought of doing Den Protector, but usually don't NEED to pull creatures from the graveyard, and at $7 each would take it out of the budget I was hoping to hit with this deck.

Tjbeagle18 - I have Hangarback Walker in my maybeboard right now. It performed VERY well in my tests, but at $12 each, they would cost more than the deck itself to get more than 2 lol. I'm also staying away from Theros block because it drops October 2nd. I currently use Inspiring Call for drawing, and at the same time it lets me attack or block with creatures I normally wouldn't because they gain indestructible. Scourge of Skola Vale would be very nice here though if I wasn't against Theros :)

I was lucky enough to pull Nissa, Vastwood Seer  ^Flip recently in a draft. I added her to this deck along with a Citadel Castellan, and both are pretty good in this deck I think.

Made a couple changes. After some playtesting, the Nissa, Vastwood Seer  ^Flip did not perform great in this deck. The Citadel Castellan was ok, but I came across some Managorger Hydras and WOW. They are perfect for this deck.

Let me know what you think and +1 if you like!!