Sigilyph-GX is card #98 of 214 in Lost Thunder (2018), a Rare Holo GX illustrated by PLANETA Otani. At about $2.44 it is the #106 most valuable card in the set. In a Lost Thunder booster it turns up about once every 117 packs. It is one of 18 Sigilyph cards printed so far.
2011Emerging Powers
2012Dragons Exalted
2016BREAKpoint
2018Lost Thunder
2020Rebel Clash
2021Fusion Strike
2024Surging Sparks
2025White Flare

















See the full Lost Thunder card list
An ungraded Sigilyph-GX from Lost Thunder sells for about $2.44. A PSA 10 is worth more, roughly $12.20 by our estimate, and a PSA 9 around $5.61.
It is a Rare Holo GX, and it shows up about once every 117 Lost Thunder packs.
PLANETA Otani drew the art for this card.
Yes, as a digital simulator. Holobrook lets you open Lost Thunder booster packs in your browser with the set's real pull rates and keep what you pull in a digital binder. No real cards, nothing to buy.