Not sure why yall saying this deck is broken, I've beaten it many times with fire king and my desperado deck. I just started Las month and made it to second stage in KC :)
Using a fox from the deck to fusion summon cat dancer will immediately give you a win most of the time. This is one of the most used deck in rank and remember, komoney don't always nerf top tier deck. So this could get another hit.
Every single deck has that combo that "will immediately give you a win most of the time". Let a super heavy samurai do their thing or aromage set up the board without doing anything and you will see
the only lunalight monster that appears in the popularity list is sabre dancer at place 50 in the extra deck only category, even below stuff like giganticastle and zubaba general