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Steam Siege

Series: XY Set code: STS Released

Illustrators (52) 5ban Graphics, Anesaki Dynamic, Atsuko Nishida, Aya Kusube, Ayaka Yoshida, DemizuPosuka, Eri Yamaki, Eske Yoshinob, Hajime Kusajima, Hasuno, Hideki Ishikawa, Hitoshi Ariga, Kagemaru Himeno, Kanako Eo, kawayoo, Ken Sugimori, kirisAki, kodama, Kouki Saitou, Kyoko Umemoto, MAHOU, Masakazu Fukuda, match, Megumi Mizutani, Midori Harada, miki kudo, Miki Tanaka, Mina Nakai, Mitsuhiro Arita, Mizue, Naoki Saito, Naoyo Kimura, OOYAMA, Ryo Ueda, Sanosuke Sakuma, Satoshi Shirai, Saya Tsuruta, Shibuzoh., Shigenori Negishi, Shin Nagasawa, sui, Sumiyoshi Kizuki, Suwama Chiaki, TOKIYA, Tomokazu Komiya, Toyste Beach, Yoshinobu Saito, You Iribi, Yuka Morii, Yukiko Baba, Yumi, Yusuke Ohmura
Official set size
114
Cards in total
116

About this expansion

Steam and steel: Steam Siege (STS) was released on 3 August 2016 as the eleventh expansion of the XY series, with Volcanion as its new face. 114 cards make up the main set, two secret rares bring the total to 116. The most sought-after is Gardevoir EX, both as a secret rare and as a regular EX card, ahead of Steelix EX.

Top chase cards

Main set

Secret rares & special cards

Set statistics

Cards in this list
116114 of them in the main set
Master set value
$472.06
Median
$0.64
Average
$4.21

Rarities

Common
31
Uncommon
30
Rare
32
Ultra Rare
21
Secret Rare
2

Top 10 most valuable cards of the Steam Siege set

01 Gardevoir EX$109.26 02 M Gardevoir EX$59.86 03 Volcanion EX$37.75
  1. 04M Steelix EX$30.00
  2. 05Gardevoir EX$26.28
  3. 06M Gardevoir EX$22.86
  4. 07Steelix EX$18.46
  5. 08Azumarill$12.57
  6. 09Professor Sycamore$11.94
  7. 10Volcanion EX$10.06

The combined value of all 116 cards of Steam Siege is around $472.06 (TCGplayer, as of 07.09.2026). The most valuable card is Gardevoir EX at around $109.26. Half of all priced cards in the set are worth less than $0.64.

For your collection

The 6 most valuable cards in this set are worth over USD 286.– combined.

Cards like these belong at the very front of your album – on display and properly protected. Let us help you with that, we have exactly the right gear:

Albumsfrom CHF 9.90

Price data: TCGplayer · Card data: TCGdex · Last updated: 07.09.2026

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