Against tree spirit spam write "thanks gg" in chat and always push the 1 more well so your enemy is forced to attack if he doesnt wanna lose on power. Then use the well to tank the tree damage and place units behind it. Firesworn is pretty good when you don't have enough space for splitting the sunstriders. On spots like the Lajesh corners where you can't place units behind your well, you obviously have to be careful with this tactic.
