Pokémon XY - Steam Siege – prices and most valuable cards
XY - Steam Siege is a Pokémon set released on August 3, 2016. Our database lists 116 cards (set code: STS).
Key facts
| Game | Pokémon |
|---|---|
| Series | XY (2014–2016) |
| Release | August 3, 2016 |
| Code | STS |
| Card count | 116 |
Most valuable XY - Steam Siege cards
| # | Card | No. | Rarity | Variant | Price |
|---|---|---|---|---|---|
| 1 | Gardevoir EX (Secret) | 116/114 | Secret Rare | Holofoil | $110 |
| 2 | M Gardevoir EX (Full Art) | 112/114 | Ultra Rare | Holofoil | $58.32 |
| 3 | Volcanion EX (Secret) | 115/114 | Secret Rare | Holofoil | $35.90 |
| 4 | M Steelix EX (Full Art) | 109/114 | Ultra Rare | Holofoil | $28.35 |
| 5 | Gardevoir EX (Full Art) | 111/114 | Ultra Rare | Holofoil | $27.71 |
| 6 | M Gardevoir EX | 79/114 | Ultra Rare | Holofoil | $23.09 |
| 7 | Steelix EX (Full Art) | 108/114 | Ultra Rare | Holofoil | $17.57 |
| 8 | Azumarill | 77/114 | Uncommon | Reverse Holofoil | $12.96 |
| 9 | Professor Sycamore | 114/114 | Ultra Rare | Holofoil | $12.92 |
| 10 | M Steelix EX | 68/114 | Ultra Rare | Holofoil | $9.85 |
TCGplayer market prices (US market) as of October 29, 2026 — for each card, its most expensive variant (e.g. holo, 1st Edition). Prices change daily and depend on condition — check the current price of a specific card and version in RipWorth.
Rarities in this set
| Rarity | Cards |
|---|---|
| Common | 31 |
| Uncommon | 30 |
| Rare | 23 |
| Ultra Rare | 14 |
| Holo Rare | 9 |
| Rare BREAK | 7 |
| Secret Rare | 2 |
FAQ
How many cards are in XY - Steam Siege?
RipWorth’s database lists 116 numbered cards in XY - Steam Siege (sealed products excluded).
When was XY - Steam Siege released?
XY - Steam Siege was released on August 3, 2016.
What is the most valuable card in XY - Steam Siege?
Based on TCGplayer market prices as of October 29, 2026, the most valuable card is Gardevoir EX (Secret) (116/114, Secret Rare) at about $110. Prices change daily.
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