I'll be honest here Cocytus should be banned, it is nothing more than a stall tool, I play invoked and I can just summon this and sit and wait how many decks deck out because they don't have an out to this.
I know I play Invoked there are decks that can deal with it but the majority of decks can't, it is a 1 card win against many decks that it is not funny anymore.
I disagree, I have came up against invoked cocytus several times and beaten it several times, I have also lost to it as well. However, I didn't feel like it should have been banned, maybe limited but not banned. Everyone hates when it used on them but loves when they use it on others. If cocytus is gone several Luna cards should be banned as well, because they do they same thing.
Attacks in defense and can't be affected by cards affects, witch decks also, and they have still yet to ban or limit the blue eyes or dark magician deck and people abuse those decks a hell of a lot more