I've been trying to make FoC snakes a thing for awhile. I've also really wanted to make Trident a thing. While I think Trident needs a buff, it's a very good artifact after the first time you play it. (Rhino pls buff Trident so that it gives you a 4/2 token the turn you play it...) Trident is also so much better with a few artifacts out that buff it every turn. And the datacores with snakes can give you plenty of excess mana. Falls isn't very good in this meta. It's probably the first card to go. A third red carnival might be better or even Serpentine Empress or Xelhua.
Temple at Delphi seems like an odd add with all the buffs for enchantments, but it is great next to a snake dens. It also protects other minions as opponents have to keep attacking a 0 attack minion.
This deck struggles against enchantment rush decks as well as overrun decks. But if you like snake decks and want something other than just BY enchantments, give this deck a try. It's a lot of fun. And I've had decent success with it. Horn + Red Carnival + excess mana does stupid things.