Mulligans
General Mulligans
Getting an early lead is key in zoo, so looking for cards like Flame Imp and Murloc Tidecaller put a big body on the board to delete your opponent's early things. Knife Juggler + Rafaam's Scheme is just really strong and Voidwalker is a nice minion to protect your smaller minions.Aggro Mulligans
Grim Rally is useful in a face race due to the power level buffing all your minions. Sea Giant and Murloc Warleader are nice in the midgame because if your opponent has also been summoning large amounts of minions and not dealing with yours, you're put in a VERY good position. Hench-Clan Hogsteed helps contest faster minions like Acornbearer.
Control Mulligans
Toxfin and Demonbolt provide a nice boost to removal, which dealing with big taunts is certainly an issue with faster decks. Coldlight Seer also helps with another common issue in aggro: board clears. It works wonders against Warpath and other cards because +2 health adds a lot of value to a whole board of Murlocs. Murloc Warleader also adds some early aggression which might end up overwhelming your opponent right off the bat.
A hyper-aggressive zoo list which utilizes Murlocs to take the early game board and drop Sea Giant to put a large minion into play. Most times Demonbolt provides a nice removal for minions you wouldn’t want to trade everything in to, like Proud Defender or Zilliax. I’ve had a lot of fun with this list and would recommend it to fans of Murloc Shaman since it’s essentially the same game plan.