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I think 3 basic lands are a little low. All of your Glacial Fortress ,and more than likely your Sulfur Falls , are coming in tapped which is slowing the progression of your deck. and paying 2 life for your Steam Vents and Hallowed Fountain each time may prevent you from reaching later turns in a game.
I would suggest heavily against Index .. It's just not a strong card at all. you're better off with think twice in it to help trigger a miracle on there turn. maybe dropping Negate down 1 to fit in an extra miracle or other utility spell, Unsummon or Dissipate perhaps, you have 5 non creature counters currently.