Sorry, but I'll put in my two cents regarding the Swamp. I just love these creatures so much.

I'm curious how you plan to shoot him down with level 2-3 shooters?

Approximate gameplay scheme for the Swamp at 160% random.
Start with Tazar. (templates from smka and 8mm6)
On the 1st, we place hydras. (it's never happened that they didn't appear :) in the fort or if lucky in the castle.
On the second, these hydras (2-3) together with Tazar take any wyvern tree. (finding it is the main task) but on these templates it's doable. Then with a super cool stack of upgraded wyverns (there were games with 50+ in the second week, +angels from conservatories), the Dragon Utopia is taken either at the end of the second or beginning of the 3rd. And then rush the opponent.

Regarding units
gnolls-worthy
Lizards are super units (damage 2-5, health is good, marksmen can't compete!)
basilisks -decent +ability
flies-super units (removing weakness and speed)
cows- I think no comment
wyverns-weak, but fast and there are many of them!
hydras-super. multi-headedness solves multi-target tasks.