The actual high cost of the card reflects its power and MTG players love of typal EDH decks
Basically, Sultai Mutate and Abzan Keywords were consistently bad, with Sultai Mutate taking last place in a massive six categories but somehow beating out Abzan Keywords by a point since Abzan Keywords ranked at or near the bottom so consistently, while Sultai Mutate managed to finish second in some of the commander-based categories
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She's great if left alone, which she won't be, but I doubt you'll get enough value out of her in most games to be worth running
Part is rules understanding by the player base
While Kari Zev isnt Ragavan, she does conjure a Ragavan card onto the battlefield tapped and attacking anytime she attacks and you dont already have one out