Hydreigon

Hydreigon (86/114), the Rare from Steam Siege, has an estimated ungraded market price of about $0.50. Note: 12 other cards named Hydreigon exist across the sets Riffle tracks, at very different values; check the collector number.

This page covers Hydreigon (86/114), the Rare (about under $1) from Steam Siege.

The other versions: #103/99 from Next Destinies (Secret Rare, about $125–$170); #99/113 from Legendary Treasures (Rare, about $11–$15); #79/101 from Noble Victories (Rare, about $10–$13); #78/116 from Plasma Freeze (Rare, about $8–$10); #97/124 from Dragons Exalted (Rare, about $4–$6); #74/119 from Phantom Forces (Rare, about $1–$2); #98/124 from Dragons Exalted (Rare, about $0.70–$1); #33/70 from Dragon Majesty (Rare, about under $1); #115/203 from Evolving Skies (Holo Rare, about under $1); #110/189 from Darkness Ablaze (Rare, about under $1); #62/111 from Crimson Invasion (Rare, about under $1); #140/193 from Paldea Evolved (Rare, about under $1).

The collector number printed at the bottom of the card is the reliable way to tell them apart.

Hydreigon (86/114) is a Rare. PSA has graded 51 copies to date, so graded supply is measurable and growing.

Of the 51 copies PSA has graded, 25% earned a PSA 10. That's a low gem rate, so flawless copies are genuinely hard to come by. Grade-by-grade population and pop-over-time appear with Riffle premium.