This is the Cipher Zoo Deck Season 28 July that he used to ladder up. Zoo 
never seems to drop out of the META as it’s tokens and value trading is always viable against most than half the decks in the META.
This is a one Sea Giant list with Leeroy Jenkins. The double Doomguard lists are sometimes more effective, but in the current META the burst damage of this deck is more important than the value trading potential of the Doomguards.
I always like Gormok the Impaler in my Zoo builds. It’s not hard to get the battlecry value and the burst damage just destroys so many mid-game minions. Give this list a go if you’ve been using a different listing and not having enough success.