This Deck is really fun and surprisingly competent. Nobody really knows what it does and it is hard for your opponent to intuit.
The gameplan is to out grind the opponent and go for lethal in turns 2 to 4. Often, the game comes to a halt, and you go to time A LOT. But with red resonator and Joyous Melffys you are more than prepared to handle that.
If you have the money, change the Knightmare Unicorn for a second S:P.
Droll and Shifter only damage this deck a little bit. Shifter hurts the grind game and Droll stops you from adding cards on your opponent's turn. I recommend to only side them in in match-ups, where they pretty much oneshot the opponent's deck.
The bane of this deck are stun and burn "strategies". I haven't found a good and reliable answer yet. Just tell yourself that stun players have already failed in life and immediately feel better.