So apparently there is a bit of a lore-dump on Kasmina in the War of the Spark art book.
Quote:
Kasmina
Kasmina is the leader of an ancient, secret order of Planeswalkers, a shadowy cabal with mysterious aims. Her larger goals are unknown, but her recent obsession is recruitment. Her prefered method is identifying what she calls "embers" - mages who possess a Planeswalker spark that has not yet ignited. She helps them discover their potential (even if it means causing a little trauma to force the spark to ignite), then indoctrinates them into the ways of her order.
It is clear Kasmina is preparing for a looming conflict, which she believes will make the battle against Nicol Bolas seem like a trivial squabble over petty [stakes?]. Despite her best efforts though, her activities are beginning to draw the attention of other Planeswalkers, and it seems that some kind of confrontation with the Gatewatch - Planeswalkers who believe in putting their magical abilities to good use - is inevitable.
Anyway, Kasmina is still at the top of my list for face-'walker of Stryxhaven, and it will be interesting to see how she corrals these "embers" together. Does she just hop around the multiverse playing teacher until she gets a student to ignite and then sends them to cult college at Stryxhaven?