Basically the core of the deck looks like this -
Leader Ability: Emhyr/Tactical Withdrawal.
Gold Package: Operator to create an extra Viper Witcher for you and your opponent. Yours can be picked up with your leader ability so it actually does what its's supposed to do. Damien to reactivate Emhyr's ability/Tactical Withdrawal. Trahaearn Var Vdrfyyr to potentially mill another important card. Canterella - we all know what she does. Maybe Vilgefortz (played offensively) and ALBAAAA!!!!! just draw some more cards out of the deck.
Bronze Package: Viper Witcher to banish a card. Duchess' Informant to clone copies from the VW created on the opponent's side of the board. Courier to place cards at the top of the opponent's deck. This enables VW to perform targetted removal of key cards if they happen to be in the top 3. Experimental Remedy to resurrect the Viper Witcher in your opponent's graveyard and a Duchess' Informant.
Have fun building and please accept the customary wishes of ill-will and poor health traditionally offered to blue control/mill players everywhere