Hmm you are right about lands, though you have enough in the deck that it probably doesn't matter too much if some come in tapped. I personally almost never run lands that come in tapped, but that does push the cost up if you want to run lands that offer more than one colour of mana. I would personally ditch
Simic Growth Chamber like a hot potato unless you're running a discard deck. I know, it gives 2 mana, but oh my goodness I draw too many bounce lands on turn 1 and 2. I've run a lot of decks using almost entirely basic lands though, and I honestly don't have too many issues ramping or just keeping up. The key there is keeping the mana cost of your other spells down as well, but green has a bunch of ramp sorceries and blue has a load of card draw, so honestly, if you're worried about cost and you are concerned your lands come in tapped, just run more basics and swap in a couple more ramp spells maybe.
You may find that if you aim to focus slightly more on tokens rather than counters and tokens, you could cut a few things here and there without missing them (though honestly, counters and tokens is kind of my thing - works its way into almost every deck, whether that's my focus or not!). If this were my deck and I were making cuts, I would probably swap
The Bears of Littjara out for a different enchantment. It's going away anyway and though it makes a token, the synergy isn't really there with the rest of your deck. You don't, I think, have any other shapeshifters, for instance. It's not bad, but it's not adding much. The third tier is particularly lacklustre, unless your group runs a serious amount of proliferate and has creatures that run into the 100s with their toughness (it does happen, my friend smacked me with a 160 power creature with trample the other day just to
ram through my 52 2/3 tokens, haha, not to mention he was running a
clone deck and that massive creature ... yeah, kind of my fault).
Similarly with
Reflections of Littjara. I didn't get the feeling from your decklist that you are going for any sort of tribal synergy, so choosing a creature type style cards are not really that great. Again, not bad, but could definitely be swapped for a stronger enchantment that doesn't break the bank. I am also not personally a fan of
Simic Ascendancy, but that's just me, it will work well in your deck if you don't choose to slim down the counters sub-theme.
I may also consider cutting
Eureka Moment. I know, it puts a land out, but personally, I still think it's expensive for 2 cards, when blue has so many more ways to draw cards. Same with
Nissa's Expedition. Yes, your creatures can help pay the cost, but ... it's not bad, but I'd rather have some enchantments that stick around and draw you cards every time a creature enters the battlefield or something. If you only bought one card and put your entire budget to that (and it's only $7) I would suggest
Zendikar Resurgent. Doubles your mana and draws a card every time you cast a creature spell. A handy artifact, if you prefer, is
Lifecrafter's Bestiary, which lets you scry and when you play a creature you can pay one green and draw a card. Or if you want to stick with creatures,
Tatyova, Benthic Druid ($4). No, she doesn't make tokens, but she has landfall, gains you life and draws a card. If you're running blue/green I can't see how you can resist (sorry, I get way too excited building decks and I like trying to keep to budgets - it controls power creep, provides challenge and my playgroup has a fun time). My final suggestion for a card might be
Ezuri's Predation. You have cards that care about 4/4 and this sorcery can put a LOT of them into play. It is a few dollars, but oh so worth (more worth than
Nissa's Expedition).
I'm assuming this deck is essentially an upgrade for the precon commander deck just released? It's a decent deck as is, so most of your changes will still be good regardless. I've offered a few options to sub out (assuming you may sub in some of my previous suggestions), but I do completely understand why you wouldn't want to spend much more money on it. Good luck either way - last time I played the precon against my playgroup this deck bounced back from boardwipes ridiculously quickly. By the end, I realised I'd forgotten half the double the tokens triggers and I still had no issues rebuilding my board time and time again. Have fun