IMO, most of the other Shaman builds I have seen are not very good. Based on the sets available, your early game is very likely going to struggle unless you hit Jade Claws. So mulligan for Jade Claws. You can sort of cheat this issue with Belligerent Gnome or Rabble Bouncer, but both feel clunky.

Spirit of the Frog is the reason to play this deck. Shaman is the only class with any card draw, so abuse it. Haunting Visions allows you to tutor for your 2 best spells: Jade Lightning and Evolve (when playing a spell discounted to 0).

Zentimo + Jade Lightning is often a blow out turn that puts you ahead of any other jade deck.

There are about 4-6 flex spots. I've filled them with Krag'wa, Zihi, Thing From Below and Bog Slosher. Zihi seals games against C'thun decks. Bog Slosher and Thing from Below have synergy with the deck, but most importantly, they're well statted minions. And Krag'wa can cycle into more Jade Lightnings or Evolves, which again, is basically your best card.

Big Bad Voodoo is a bad card. So are guys like Big Time Racketeer and Former Champ. I wouldn't play those cards. Evolve and Doppelgangster are all you really need.

I could see an argument for playing 1 Stormcrack, but I think Haunting Visions > Lightning is so important that I wouldn't do it.