The situation on the ladder is unique in a way which lets us determine the meta warp score quite easily, because all the variables except one was left unchanged - that one being, Imbue Hunter OTK is broken.
Playrate of Imbue Hunter before the patch - 1,69%
Playrate of Imbue Hunter after the patch - 19,86%
Playrate of Imbue Druid before the patch - 4,49%
Playrate of Imbue Druid after the patch - 20%
Meta Warp score = (Playrate of Imbue Druid’ - Playrate of Imbue Druid)/(Playrate of Imbue Hunter’ - Playrate of Imbue Hunter)’ = 15.5 / 18,17 = 0,8287 ~ 83%
Being one of the most consistent counters to the deck, Imbue Druid grew in popularity for 4.5 times simply because of how strong Imbue Hunter is.
For the people with slightly less dominant cognitive skills, it’s this increase of hunter counters on the ladder by factor of almost 5 times coupled with the increased frequency of Hunter mirrors for 20% that lead to the deck’s winrate being 50.4%
It’s actually not balanced at all, and that’s visible from the Meta Warp score. I have never seen something as warping as this in a way that makes it so easy to calculate. A truly unique situation on the ladder. It’s as if they’re purposefully performing A/B testing and have to keep all the other variables unchanged to get clear data untainted by other variables changing.
At this point it becomes clear to me, that there are no devs. Balance changes are done by an AI.
EDIT: I calculate meta warp scores every meta using various formulas and methods, but this is the only time I’ve ever seen such a pure case of meta warping, where all the other variables that could impact it remain unchanged. Ofc, this is still just a correlation factor, so it doesn’t prove causation, but when you see that other things are left unchanged, and when you quickly discount some confounding factors, the only conclusion you can make is that this, indeed, a meta warp score.