I'm liking melee heavy attacks with the water deck as well. Get River Helondale, Demented Shark, and Pirate Captain on the same team and you can have a tank and two sneak / opportunity attackers getting +3 damage each. That's some heavy fire power to defend against and has gotten me a lot of wins. With water's +1 speed / armor summoner boost and some strong melee attackers this is a strategy we'll be seeing (and using) for a long time in Splinterlands.
Yeah I've tried this before and it was so fun! I really enjoy the whole sneak meta of water, and the +1 armor really adds some extra survivability.