I have beaten them with my ulu watus, but is there any other clan, that can take them on??
Most clans can beat GHEIST and most lose to them, same as any other clan you face. Its all down to tactics and how you use your cards. GHEISTS weakness is that they can stop bonuses easaly so Nightmare, Skeelz e.c.t keep their abilitys and attack, power, damage maipulation clans can manipulate them.