I don’t usually play with the deck tracker so I don’t think I can collect any W/R data, I’m rank 15. It’s not meant to be a tier 1 deck keep in mind, especially it doesn’t perform very good against aggro so I would say it’s tier 4 or 3 at best.
It’s just a fun deck if you like to play big buffed dudes.

I agree on Ysera, my opinion is that the card is powerful enough to have in the deck. It’s meant to be played as a Chef Nomi like effect, after the highlander cards have been already played. Most of the times it works fine, altough it’s fine to replace it for another big dragon like classic Ysera or Alexstraza.

Regarding the doubles in the deck, having 2 doubles does not block the highlander cards in the most cases, considering that both Alexstraza and Zephris are late game cards and the deck has some amount of card draw in it. Moreover, the 2 cards that are doubled are key cards in the deck and the consistency of hitting them with only one copy wouldn’t be enough in my opinion.