When it comes to protecting your board, few cards do the job as well as this one (though unlike Teferi's Protection, it gives no such security to your life total)
Her Blue/Black/White mana coloration means she'll be able to prioritize spells over creatures, allowing players to wield the same level of power as she did in-game
The original images of the card showed the ID as 41/P1 meaning it would have been the 41st promo in the 1st Promo set
As mentioned, we do know this set will be legal in Standard, and therefore also legal in Modern and Pioneer (and Commander, Vintage, and Legacy)
It only costs three ink to get out, has a strong will power stat of eight, gains you passive lore, and has a strong ability that Im sure Amber/Steel and Amber/Aggro decks are going to like