The reason it sees so much play is that it is doing two things that are well paired, both stalling the game and it is never a dead or even that weak of a card in any given matchup
Many times the flavor text on an MTG card is hilarious
The labels describe the set and name of the Pokmon card along with the number grade
You obviously can't be going too far away from control at this point but you likely have to be doing something really broken to be winning games
Like most Magic: The Gathering cards, the value of Kasmina, Enigmatic Mentor depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Jumpstart 2022)
Thats a historically massive metagame share, second only to the reign of terror by Oko, Thief of Crowns back in 2019