A good army to beat Karador on impossible with a paladin?

[McSwan]

I started with copying the dryads and making both dryads summon thorns, then your starting area is jammed up and the bone dragon can't attack you initially, and instead they kill the walls.

Also, all the undead units get jammed up and fire rain can kill quite a lot. It was very easy battle with my mage, I suspect it would be more difficult as a paladin though.