I really like your ideas, some very clever implementations. Some thoughts:
Fleet Falcon is neat, I like the idea of turning Falcon Dive into a creature. As has been mentioned it looks a bit undercosted, as being able to harvest or double-harvest before hitting would make it very strong. 2 Faeria probably wouldn’t step on Wind Soldier’s toes, though using it as a double harvester away from everyone else is a good upside.
I like the idea of Landfall presented in Tarum’s Tender. Would probably need a cap, but a very cool green version of B/Y event creatures
Enchanted Ursus is a clever multi-color card but I think it rolls an entire deck into one card and is both a little abusable and negates the usefulness of the enchant cards themselves (why run Grizzly and willow as targets when you could run this, another beater, and 6 other utility cards).
Devour the Meek is great. Fight makes perfect sense as green’s removal option and targeting the lowest cost creature keeps the board relevant while making sure it isn’t too powerful.
Bursts of Insight is a neat concept, letting you draw cards to use the faeria you’re getting but REALLY hard to template. As it is now, you would need creatures next too but not at wells before playing it (they would harvest at the start of turn before you could play cards). It also requires two harvests to be more than a cantrip. Maybe something like, “draw a card, whenever a friendly creature harvests faeria next turn, draw an additional card”?
Trials of Flame is neat anti-green tech. Probably fairly costed as well.
Secret paths is probably too powerful to print at a price where it would be useful.
Master Fletcher may or may not work as you intend. I think it actually disincentives ranged creatures because you can just play more aggressively statted creatures defensively before dropping a Fletcher and going face. If you wanted to make a ‘ranged-lord’ type effect maybe giving him some power and either a +2/+0 for ranged while next to him or letting ranged creatures that start their turn next to him move and attack?
Herald of the Forest World should probably read “The first time you make a forest each turn…” unless you were going for bust landfall triggers. Of note though is that Tarum + Herald feels like it should be a good combo but is actually horrible. Right now, you would burn through your deck and maybe kill yourself in the process, and if you make it once a turn you just never get to use Herald again.
Timberland Growth is neat and the scaling cost is a great idea, but costing this one is really tough. It might want something other than a bloomsprite to make it more balanced, a green version of a farmboy or something.