Pokémon TCG · 2016 Set Guide
Steam Siege Set Guide
The XY set with the most Pokémon BREAK, seven of them, and fewer Pokémon-EX than most. Volcanion-EX and Magearna-EX are new; a secret-rare Gardevoir-EX is its most valuable card.
Overview
Steam Siege is the eleventh XY expansion: 114 cards up to the printed total and two secret rares above it, Volcanion-EX and Gardevoir-EX (115 and 116).
It leans on Pokémon BREAK, with seven, more than any other XY set, and has six Pokémon-EX. Volcanion-EX's Steam Up powers up Basic Fire Pokémon, and Magearna-EX's Mystic Heart protects Pokémon with Metal Energy from attack effects. Prices are among the lowest of the series.
Cards and rarities
Steam Siege has 116 cards. Every card shows its number over the printed total along the bottom, as in "1/114", next to the set code STS.
The printed total is 114, so the 2 cards from 115 to 116 are secret rares. Set completion in TurnZero HQ counts a set against its printed total and keeps the secret rares apart, so finishing the main set and chasing the cards above it read as two separate goals. How set completion works →
Headline Pokémon
Six Pokémon-EX, two of them Mega Evolutions, and a long run of Pokémon BREAK:
Volcanion-EX
Steam Siege #26
180 HP. Steam Up: once during your turn, discard a Fire Energy from your hand to make your Basic Fire Pokémon's attacks do 30 more damage this turn.
M Gardevoir-EX
Steam Siege #79
210 HP Mega Evolution. Despair Ray does 110 plus 10 for each of your Benched Pokémon you discard.
Hydreigon BREAK
Steam Siege #87
190 HP BREAK. Calamity Blast does 150, discards 3 Energy from it and does 50 to two of your opponent's Benched Pokémon.
Trainers worth knowing
Two Supporters from the set:
The chase card: Gardevoir-EX
Steam Siege's chase card is Gardevoir-EX, numbered 116/114, a Rare Secret, illustrated by Eske Yoshinob, at $108.73 on October 22, 2026.
The Rare Ultra M Gardevoir-EX (112/114) was second at $57.69 and the Rare Secret Volcanion-EX (115/114) third at $34.80.
Gardevoir-EX is printed three times in Steam Siege. The Rare Holo EX (78/114) was $5.97. The Rare Ultra (111/114) was $26.80.
Every Gardevoir-EX in Steam Siege
| Version | Number | Market price, October 22, 2026 |
|---|---|---|
| Rare Holo EX | 78/114 | $5.97 |
| Rare Ultra | 111/114 | $26.80 |
| Rare Secret | 116/114 | $108.73 |
Only the exact version is worth its price. The number at the bottom of the card and the rarity symbol beside it tell you which one you pulled. Reading the number and rarity symbol →
Chase cards and prices
The secret Gardevoir-EX leads, nearly double the full-art M Gardevoir-EX in second.
| Card | Rarity | Market price, October 22, 2026 |
|---|---|---|
| Gardevoir-EX | Rare Secret | $108.73 |
| M Gardevoir-EX | Rare Ultra | $57.69 |
| Volcanion-EX | Rare Secret | $34.80 |
| M Steelix-EX | Rare Ultra | $28.33 |
| Gardevoir-EX | Rare Ultra | $26.80 |
| M Gardevoir-EX | Rare Holo EX | $23.36 |
| Steelix-EX | Rare Ultra | $17.28 |
These are each card's headline TCGplayer market price on October 22, 2026. Prices can move a long way, most of all in a set's first months, so treat them as a snapshot. Each card's page shows today's price for every variant and its 90-day chart. How Pokémon card prices work →
What a complete set costs
One copy of every card in Steam Siege, bought as singles, cost $428.87 on October 22, 2026. That is the 14th most expensive of the fifteen sets in the XY series.
The three most valuable cards, Gardevoir-EX, M Gardevoir-EX and Volcanion-EX, come to $201.22, or 47% of the total. Without them the set costs $227.65. Of the 116 cards, 93 were under $2.00, together $32.15; the other 23 add up to $396.72.
Each card is counted at its cheapest priced variant, a Normal copy rather than a Reverse Holofoil where both exist, at its TCGplayer market price. This is what it costs to buy the set as singles. It is not what opening packs returns, and not what a complete set would sell for, which after fees and the many cards worth cents would be noticeably less.
Playing it
No Steam Siege card carries a regulation mark, so none is Standard-legal as printed. Standard has allowed only the H, I and J marks since April 10, 2026. Every card in Steam Siege is legal in Expanded, which takes every set from Black & White on.
A reprint with a legal mark makes older printings of the same card legal again, so check a card's name before you rule it out.
Frequently Asked Questions
When did Steam Siege release?
August 3, 2016. Its set code is STS.
How many cards are in Steam Siege?
116. The printed total is 114, and the 2 cards numbered above it are secret rares.
What is the most valuable Steam Siege card?
The Rare Secret Gardevoir-EX (116/114), at $108.73 on October 22, 2026, ahead of the Rare Ultra M Gardevoir-EX (112/114) at $57.69. Prices move daily, so check each card's page for the current figure.
Track your Steam Siege cards.
Scan cards in by the set code and number at the bottom, see how much of the set you own, and value every copy from daily TCGplayer prices. Free to start.
Create Free AccountPokémon and Pokémon character names are trademarks of Nintendo. ©Pokémon. ©Nintendo/Creatures Inc./GAME FREAK inc. TurnZero HQ is not affiliated with, sponsored, or endorsed by Nintendo, The Pokémon Company, Creatures Inc., or GAME FREAK inc. Card data comes from the open PokemonTCG dataset, and prices from TCGplayer.