Trevenant is card #XY14 of 211 in XY Black Star Promos (2013), a Promo illustrated by Kouki Saitou. At about $0.76 it is the #208 most valuable card in the set. It is one of 21 Trevenant cards printed so far.
2013XY Black Star Promos
2015Primal Clash
2016BREAKpoint
2019Cosmic Eclipse
2020Rebel Clash
2022Lost Origin
2023Obsidian Flames
2026Ascended Heroes

















See the full XY Black Star Promos card list
An ungraded Trevenant from XY Black Star Promos sells for about $0.76. A PSA 10 is worth more, roughly $6.08 by our estimate, and a PSA 9 around $2.13.
It is a Promo.
Kouki Saitou drew the art for this card.