I'm going for this box, I started playing a couple of weeks ago and this is a nice addition to my F2P BE deck. Dyson Sphere will be a really good mid o late game option for my BE deck.
Playing BE deck, I never really saw a need to run a second Spirit Dragon so I run cloud castle instead to revive spirit, Giganticastle or Vermillion form the grave to that's my answer.
playing 2 is fine. Gigancastle could be negate and can't dodge target card. The first spirit could be banish or it's summon could be negate in some instance. It's just budget option to run 1 and a gigancastle.
more like micheal to banish and otk in your turn. But if you summon 2nd spirit, chance are your first got lighting vortex so you could still use azure.
I've been using it for almost a month now to and able to KOG with it. There is actually a little your opponent can do to prevent you from using cloudcastle as 2nd copy of spirit. They have to banish it and it's not that easy since it can tag-out so if in feild you have o use 2 cards to banish it most of the time. There are however a few times where you really dont want a cloudcastle in your feild.