Too be fair I have beaten early Kozmo as well with Noble Knights. If you can loop Artorgius and keep him on the field he's a bitch to deal with even now. It's just the he is easily outed without excalibur. But yeah combining BA with any deck that can get graveyard advantage is easy. Just look at PK Fire. It's insane. I've even seen Madolche Abyss. Beat my kozmos. Burning Abyss I don't believe deserve Dante to 1 it kills the pure variant. 

Also yes Skull Servants are also hilariously trolly.