I found typical zoo to be too fast for my liking, so I decided to mess around with some C'Thun cards and finally made a midrange zoo of my liking
Basically, this deck is a less aggressive, more midrange-oriented version of the classic zoolock, and it also throws in some C'Thun cards. It has more lategame, featuring minions like Usher of Souls, Twin Emperor Vek'lor, and C'Thun.
Generally, this deck looks to have a strong, zoo-like earlygame with both zoo and C'Thun minions, and it also utilises buff cards like POW, Abusive Sergeant and Dire Wolf Alpha to make favourable trades. In the mid to late game, play your C'thun minions and finally close out the game with Twin Emperor and/or C'Thun.
Mulligan hard for your earlygame, and throw out anything that's not a 1-2 drop MINION, even with coin. Note that this deck is meant to be played like a midrange shaman/hunter, unlike the typical aggro zoolock.
TLDR, play like a midrange deck. Make favourable trades in the early game, and follow up with your strong late game, featuring C'thun and Twin Emperor.
-1 Power Overwhelming +1 Kara Kazham!
-1 Acidic Swamp Ooze +1 Dark Iron Dwarf
-2 Possessed Villager +2 Argent Squire
-2 Dire Wolf Alpha +2 Defender of Argus