As a response to the ramp that Wolff and Soren suggested I steered away from the green mana elves and stuff although birds is probably fine because of how hungry the deck is for blue mana. alot of the big fatty leviathans and stuff are mostly blue mana and I don't know that elves are great in this deck yeah they tap for green and maybe the deck
ends up heavy green to start with then end game blue heavy so some like
cryptolith rite to make the elves tap for blue isn't a bad idea. Although while putting my preliminary list together it felt like a mono blue deck splashing green almost. I may be wrong I don't know
Also
breeding pool is probably not a bad idea for this deck. and unfortunately I think the only other U/G duel is trop and that's not really an option.