Mulligans
General Mulligans
Maelstrom portal + thalnos is a good keep but only if you have both of them and are against aggro.
This deck is a spell heavy shaman that focuses on drawing enough damage, through auctioneer and lots of cheap spells to kill your opponent before he is able to kill you. Its main finisher would be something like leeroy+windfury+rockbiter for 18 dmg.
Another win condition is to flood the board with totems from withdoctor + a lot of cheap spells and evolve to get a big board. An example of this is Witchdoctor + lightning bolt + Maelstrom portal+ frost shock + evolve. to generate a random 5 cost minion and 4 2 cost minions.