Ok, many ppl have done dis idea but still let me put this :3
So. New dark troop: Wereworlf
His speed and attack would be veryyy high in exchange of pretty low health. When summoned he would yowl like each 30s making all released units have +10 damage and heal them up like 50health points (so he would be usefull in low-health troop raids). About attacking i think that he would be best to release like in the middle of raid at the side, with most cleared defenses, so he could clean up buildings with help of idk witches i think. So best attack strategy with him would be: giants, golems, lava hounds (taking out defenses), then babarians, valkyres, archers etc. (taking rest of the base out). So this strategy would be usefull for loot not very near center considering that troops that attack defenses die in like middle of the fight as i have experienced. About defense, so it would be this- multi-targeting infernos, centralized mortars, and well protected teslas for killing troops that attack defenses fast. I think thats it! Sorry for not very good english. Keep clashing well!