I have gone over your roster several times.
I have tried thinking of different team composition's which other people have used.
Every time I try to recreate the teams with your roster you seem to be missing 1 or 2 heroes.
It is a very difficult situation.
Tyrant is an amazing hero against Spider Stage 20.
Tyrant is the perfect affinity for it.
However, Tyrant is negative affinity against Spider Stage 15.
You own Skaarg.
A few people have told you to try Skaarg.
I don't own Skaarg.
I have never used Skaarg.
The people I have talked to have never used Skaarg.
I have read Skaarg moves.
Skaarg can do an HP burn, but it seems he only does it under specific condition's.
I am not entirely sure how the skill works.
I also don't know how Skaarg AI works.
This hero is a total mystery to me.
If I was you, I would contact people who own Skaarg so you can get insight on him.
Best Case Scenerio: Skaarg helps you win
Worst Case Scenerio: Skaarg doesn't help you win and you used up a few chickens on him.
If you ask around, You might be able to talk with people who own a Max Skaarg.
They might be able to save you some chickens.