The non-simorgh variant I have been testing the past week, also probably the list I will be taking to the WCQ at the end of the month. Have been having a lot of success with it, especially against Naturia/Runick, not much practice against Kashtira but it should do relatively well, I'll update this next week after some more practice. In the main deck, I simply replaced the Simorgh package with 2 Harpie Harpist, a Terraforming, and a Feather Duster, and I replaced my 3 Book of Eclipse for 3 Book of Moon because I feel like you mostly only need to book 1 card, and this one can't be ashed.
I also changed the side deck a little from the Simorgh variant, I felt like Advent was not enough to play for time, as it can only be used if you start, which won't always be the case game 3 so I added Dogwood. I also think Dark Hole is a good card to have in this meta, and I found D Barrier redundant with Feather Storm already in the side, so I simply added a trap trick to use as a 4th copy of Feather Storm. Nibiru is the big "if" in this list... It is basically only useful going 2nd, and only if you have it in your opening hand, but it helps play against Kashtira if they try the full combo.