So, like I've been asking everybody, why did you ban the cards you did and how did that affect your deck-building strategy?
Pretty simple -- water doesn't really pair well with Gravity, so if you eliminate permanent control, shields rule -- and Water has the best shield in the game. Creature Control can deal with Butterfly Effect, so out went Steal, Deflag, and Pulvy.
Second, eliminate Permafrost so that I don't have to worry about the best shield in the game being used against me (didn't count on Mindgate letting him 'borrow' mine!)
Third, eliminate easy healing: SoG must go.
Finally, Water is the element of CC -- and Quint kills CC -- so Quintessence had to be banned as well.
Realistically, the lack of permanent control and Quint had a HUGE effect on the way that I built my decks; the other bans, not so much -- they were more to limit his deckbuilding options than to guide my own.