Mulligans
General Mulligans
These cards are the key cards to get the board immediately in your favor. Any one drop into shadow ascendant is OP, especially if you can throw in a happy ghoul for free.
The goal of this deck is to basically win the board and keep it that way, killing your opponent around turn 7. You do this with cards such as happy ghoul, which is often going to be a 0 drop 3/3. Once you have the board, use this to have things like shadow ascendant and young priestess to keep the board in your favor. Maybe add in one or two inner fires to synergize with light well, talonpriest, etc.