Thank you so much for the comments.
I wanted initially to make it mono-green, but I'll give some thought to the extra colors.
Winding Constrictor provides an extra creature, but
Hardened Scales is cheaper to cast, harder to kill, and doesn't pose a risk for infect.
I'll definitely test a
Rishkar, Peema Renegade and see how it does (I have it on my EDH deck)
I like all your other suggestions, but in my group play we have a rule to enhance homebrewing - only cards less than a certain price are allowed (2 euro, around $2,5 - shop prices). It limits your options, but encourages you to find alternatives. That's why the deck is so cheap.
I'm afraid this rules out all of them.
Dromoka's Command would have been great instead of
Nature's Way though. I'll wait and see if it drops a bit and maybe move to GW.
Again, thanks a lot for all the suggestions.