Assuming U.A. don't get Jersey (I hope they don't get Jersey, that would be very stupid here), they'd need a consistency booster like Foolish Burial Goods or Terraforming to perform well. They REALLY need their Field Spell to keep up with other decks. (The fact they're very weak to disruption also hurts given cards like Spellbook of Fate, Canadia, Floodgate and Treacherous Trap Hole are common.)
Thank you for the answers, all. This deck looks really cool and I hope it will be playable because I have never been able to enjoy using water decks for some reason.