👇 Explore every card in the set
Browse every tracked card in Steam Siege with live prices, 24h moves, and collector details. Use Hits and Chase when you want a focused view of the set.
Release date, card count, chase cards and how it compares with the XY era.
Steam Siege is an XY-era expansion in the English-language Pokémon TCG, coded STS, with 114 official cards plus 2 secret rares for 116 catalog printings in all. Its structure is built around EX cards: Gardevoir EX and Volcanion EX each appear three times, while M Gardevoir EX, M Steelix EX and Magearna EX each appear twice, and Grass, Water, Fire and Metal are the types it leans on. The release date was August 3, 2016, and the card list is mostly Rare, Common and Uncommon cards, with 21 Ultra Rares sitting above them.
The chase cards in Steam Siege are its 23 chase-tier cards, made up of 21 Ultra Rares and 2 Secret Rares that are numbered past the printed 114. The most valuable cards are the Secret Rare Gardevoir EX, illustrated by Eske Yoshinob, then the Ultra Rare M Gardevoir EX, the Secret Rare Volcanion EX and the Ultra Rare M Steelix EX, with 5ban Graphics credited on the last three. Value is concentrated: the top five cards hold 60 percent of the set's total card value, so a handful of EX cards define the set far more than its large bulk of commons and uncommons.
Steam Siege was released August 3, 2016.
Steam Siege has 116 cards.
Steam Siege is part of the XY era.
23 cards in Steam Siege sit at one of its hit rarities. See this set's hits page for the full breakdown by rarity.
As of October 2026, Steam Siege ranks 14th of the 14 comparable XY sets by total card value, at about 0.3 times the era median, and 119th of 130 across the whole game. Its top card also ranks 14th in the era, while trading activity is somewhat better at 11th. At 114 printed cards it sits about level with the era median of 113. It followed Fates Collide, which holds more total value, and came before Evolutions, which also holds more. Its cards first appeared in Japan in Fever-Burst Fighter and Cruel Traitor, both released June 17, 2016.
Written from market data as of October 23, 2026; the tables update live.
| Measure | This setSteam Siege | Previous setFates Collide | Next setEvolutions |
|---|---|---|---|
| Release date | Aug 3, 2016 | May 2, 2016 | Nov 2, 2016 |
| Printed cards | 114 | 124 | 108 |
| Master set value | — | ≥ $874.09 | $792.66 |
| Most valuable card price | — | $165.87 | $124.93 |
| Priced cards | — | 126 of 129 | 113 of 113 |
Completing Steam Siege means finding all 116 catalog printings, and every one of them is priced. Because the top five cards carry 60 percent of total card value, the cost of a complete set is driven by a few Gardevoir, Volcanion and Steelix EX cards, while the remaining commons, uncommons and rares account for a small share of the set's overall value. The set has 25 sealed products listed, including a booster box and booster case, Elite Trainer Boxes, tins, blisters and decks, which gives sealed collectors a wide range of formats from the XY run.
Sealed Steam Siege: all 25 products with prices
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