I came around the top 500 with this deck (eventually losing and winning) with a win rate of 67% (35-17)
This deck wins by putting pressure on the board and also plays the secret pack which can be annoying for the enemy, plus it has many card draws. It also has mass removals for the big boards and to stay on the board at all times.
In some match ups where it is essential to have a mass removal (such as hand lock or shadow priest) do not trade City Tax unless you have to.
In other matchups like mage or quest hunter where you don't need mass removal trade City Tax as soon as you have mana available to do so.
For the rest play the mana curve and have fun :)
Keep Northwatch Commander only if you already have a way to put a secret in the mulligan.
sometimes you can keep the mulligan Aldor Truthseeker if you already have a nice mana curve for the first few turns, play it with the coin in turn 4 too.