CSS, your build is okay, but I dislike relying on Sliver Queen as the main kill. I think that the best setup is Eternal Witness, Sliver Queen, and Kumano, along with Cunning Wish in place of Lim-Dul's Vault. This allows for kills by the traditional self-mill and switch to Kumano or Sliver Queen (broken up by Witness if needed), a self-mill and switch to Witness for Wish for Stroke, and a combo-out with no Bazaar but a Wish in hand and then Wish for Stroke either on the opponent or for your whole library, after which you break your own combo with Wish for Blue Elemental Blast and then hardcast Kumano. This setup allows for the greatest number of possible kills with the fewest maindeck slots dedicated to dead-draw victory conditions (really just 3 slots, since the Wishes also get Naturalize, Rebuild, etc. in the course of normal play). I think that the 5-color versus 3-color question is valid (my team is currently going 5-color), but running just Sliver Queen is ludicrous.
Where to begin? Hmm...Did you notice that I am running Eternal Witness? If you did than how can you say I am relying on Sliver Queen? I have no problems pitching Sliver Queen to Force of Will in various match-ups because I still have access to the Ancestral Recall Kill.
Lim-Dul's Vault is awesome in Dragon. It can usually assemble the entire combo, and it helps support the deck's blue count for Force of Will. It is the one card in the deck that I think makes Dragon so consistent, I just can't see why you wouldn't use it.
Cunning Wish doesn't seem that effective of a card in Dragon to me. The idea that you can go off with Cunning Wish without the need for Bazaar of Baghdad is great, but how often are you not going to have either Bazaar of Baghdad, Compulsion, or Intuition? That is ten cards that let you combo out that turn in the scenario you are describing, so I am not sure if that is that important of a factor. Also in your example you would have to spend
{G} to remove a nasty enchantment like Ground Seal. Which in itself isn't horrible, but if there wasn't anything nasty to remove you would have a card in hand that can't assemble your needed combo parts. If Cunning Wish didn't remove itself from the game I would probably have a different opinion of it, or I would at least rethink it. But as it stands now if you use it to remove something or if you use it to grab a Vampiric Tutor, you can't use it to win later on. When it comes to handling problem permanents game one I rather just use Lim-Dul's Vault and search for Echoing Truth. It cost me
{U}{B} which in most cases is easier to achieve. (
This is mainly because the double blue is usually spread over two turns so it really isn't an issue, and 
is more readily available to you than 
) And in the cases where there isn't anything I need to remove I can use Lim-Dul's Vault to assemble the combo pieces I need. And remember your maindeck is for game one. In game one you always need to assemble your combo, but how often to you need to fight through permanent based hate? I think the way you have to approach this is, assembling the combo drastically out weighs fighting hate game one, and if it doesn't play another deck.
