What I would imagine is a SC bowman. One missing SC bowman character in Gwent would be Chireadan. (
https://witcher.fandom.com/wiki/Chireadan)
So I would guess him to be the new SC card.
Assuming it´s him let´s guess his ability. This we know about him: "Despite elves typically not finding
humans to be attractive, he was secretly in love with
Yennefer, though he never revealed his feelings to the sorceress".
What I would assume is a payoff card getting an advantage dependent on the total amount of different allied elf mages or played SC spells.
Please find attached my example.