Steam Siege entered circulation in 2016. It belongs to the XY series.
The checklist contains 116 cards, placing it in a mid-size expansion range. As of 2026, the set is 10 years old and now falls into an established back-catalog period.
In the Steam Siege checklist, Shellos occupies position #28 as a Common card.
Shellos appears in Steam Siege, released in 2016. Card flavor text reads: "Its shape and coloration vary, depending on its habitat." Core profile: Its card type is Pokémon.
The rarity label is Common. Printed HP is 70.
Energy typing is Water. Card subtype classification is Basic.
The printed attacks highlight "Rain Splash". The card has a weakness to Grass.
Shellos from Steam Siege is currently trading around $0.20. Its 7-day movement is largely flat at 0.0%.
Against its 30-day baseline of $0.17, this card is pricing 15.2% higher. The 90-day window shows a floor near $0.16 and a peak around $0.20 (20% total spread), which maps to moderate-volatility movement.
This version is categorized as Common.
Collectors tracking Shellos often benchmark it against other Shellos cards. Comparable entries in this snapshot: 3 cards, 3 distinct sets.
In this sample, pricing ranges between $0.06 and $0.21 (250% total span). Relative to the alternative average ($0.12), this card is +67%.
Notable alternatives include Shellos #39 (Lost Origin) at $0.09, Shellos #46 (Surging Sparks) at $0.06, and Shellos #29 (Crimson Invasion) at $0.21.
Market structure summary: The latest week is near flat (0.0%), suggesting consolidation rather than breakout behavior. Observed 90-day bounds of $0.16 and $0.20 create a 20% band, matching a moderate-volatility profile.
Current value is 15.2% above its 30-day reference ($0.17). Condition sensitivity is substantial: PSA 10 carries a +12415% premium over raw value.
PSA 9 is currently around $20.00, while PSA 10 is $25.03.
