Maintaining top 100 masters with this list over like 15 games (dropped a bit - went up a bit - deck crushes Even Feln and surprisingly has solid game against FJS - but gets crushed by SS just like every other deck, you know the drill ).
Just trying the mistress - it's likely the 4th Tasbu is still the better choice. Yes sometimes you have to cast Tasbu on 6 because of the Contract - but that card is the only thing that keeps Wisps even a reasonable strategy sometimes. Xenan insignia when so I can run xenan temple main :(
Main thing to keep in mind - this is a synergy based deck - you can chump in seemingly odd spots just to get the engine going you don't need to "go for value". Tasbu, Soulbringer and dark wisp/ devour will recoup the card advantage loss most of the time.