I listed some possible teams I can build for silver and gold league, this means a maxed silver team. Here's a maxed silver Water deck for you to consider.
Water is the most expensive deck to build simply because there are a lot of good cards and can play both melee and non-melee games (unlike Fire and Earth). I myself use water in almost all rulesets except when water is not allowed. 😄
Epic CL cards are too expensive at ten copies, more expensive than the legendaries. These can be bypassed and to reduce the cost by $60. Of course, you can also opt to rent some of the cards in the list.