I have a tatic by goblim madness you must have in your team full upgrading (unit) were-tiger and a dragon,
and so much monster as you can for example = goblins and (unit) dwarf enigeer.
by skills you need (skill) tower and a meteor.
with this combination you can with the (skill) tower the goblim who ar falling damage so that you units faster can go to the enemy castle , when the black goblins coming you let fall the meteor its does damage, so its is easy to win.