So I know we've discussed this elsewhere, and I think off the top of my head I can see a few things I'd recommend purely to streamline things a little for you.
Here's what I'd cut at a quick glance:
Fauna Shaman - too slow for mono green
Duskwatch Recruiter - really just doesn't do enough
Genesis - I actually love this card, but I think it's a little dated sadly, it just doesn't do enough these days and it's a bit costly
Timbermare - This is a neat trick, but I think if you're hitting the right sort of cards this is really just surplus to requirements
Verdant Sun's Avatar - As far as ETB triggers go, lifegain isn't amazing. Personally, with Nissa, I don't tend to have too many issues with life totals, but then I do run a
few fog variants
I'd HIGHLY recommend adding in
Woodland Bellower. It's a very strong card. Great ETB, and it allows you chain together some bodies on field and get some other great ETB effects like
Wood Elves,
Reclamation Sage (why isn't this in the list??) and such. A favourite play of mine is to drop Bellower, fetch
Fierce Empath, grab whatever other beater or control element I need at the time and set up my hand with some options.
Another really cool recent printing you should look at is
Bramble Sovereign. That card is NUTS. Especially considering you're running
Seedborn Muse, that puts your game on like, the easiest mode possible.
As I mentioned elsewhere, I personally don't think a lot of cost reduction in mono green, it seems surplus to requirements. Sure your stuff can get expensive, but you can also vomit most of your lands onto the table with relative ease, and the cost reduction you get from medallion et al is minimal by comparison; especially when you're running lands and creatures that can produce dozens of mana in the right place. I would definitely prefer to focus on land drops and/or mana additives, both of which you're sort of already running, so these seem like easy ways to trim some unnecessary inclusions. You could look at adding more removal, I guess, or more ramp, or whatever else you might like.
I'd also strongly recommend trying out
Thorn Mammoth from the last set. Really good removal option, I swapped out
Polukranos, World Eater for this and have not looked back at all.
If, as [mention]MeowZeDung[/mention] mentioned you do decide to go down the route of ETB triggers, those recommendations are good; there's also other options with things like
Temur Sabertooth,
Wirewood Symbiote, and
Invasive Species. It's a small selection of cards to go with, but I think it's a strong option for Yeva, you have plenty of ways to make it really work well for you. And honestly, even if artifacts are hard to search up for us, the times you do get
Cloudstone Curio and/or
Panharmonicon on board really do make it worth their respective additions. They are just grossly strong.
Wirewood Symbiote in particular, you could continue to bounce something like
Wood Elves or
Reclamation Sage with
Karametra's Acolyte in play to grab yourself a straight up butt load of
and get all of your forests in play or wreck the entire board state.
Hope this all helps and doesn't come off too critical; you're more than welcome to drop your list over on my primer, there's plenty of mono green brewers who can help you with critiques and options to help Yeva pop again