Elves players have just got a whole new planeswalker just for themselves. Tyvar Kell will not do too well in any other archetype except Elves, and it's going to be more prominent in commander, standard and maybe modern.
The card's ultimate ability is very strong, but it will take you three whole turns to get there, unless you employ some sort of counter accelerator. This does make Tyvar Kell a bit too slow for constructed formats.
Niche planeswalkers rarely do too well on the market, and thus will lose at least half of its current pricing. Expect to see it at around $3-5 a piece once the meta settles.