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moonstone is independent research and market data, not financial, investment, tax, or legal advice. Prices are real recorded transactions and live market data, USD only. Collectibles are speculative, illiquid, and volatile and can lose value; past performance is not indicative of future results. See the full disclaimer. Pokémon and its trademarks are the property of their respective owners; moonstone is not affiliated with or endorsed by Nintendo, Creatures, Game Freak, or The Pokémon Company.

Set screenas of 2026-09-27

Steam Siege

One set, four readings of undervaluedevery figure recordedSet pageOpen in the screener
Cards116
Priced116
Median raw ask$0.29
With PSA 10 tape21
Median PSA 10 premium19.0x
Set median, 90d−1.7%

Pick the reading

PSA premium spread21Cohort laggards17Gem rate vs price26Distance from peak15

Which Steam Siege cards sit deepest below their own recorded high? Distance is measured on each card's series, highs of $5 or more, so a card that never traded above pocket change cannot lead this list.

Distance from peak

15 of 116 qualify

distance below each card's own recorded high on its series, highs of $5 or more, deepest first.

#CardFrom highRecorded highNowSeries from
1
M Steelix EX card art
M Steelix EX#109 · Ultra Rare
−17.4%$36.522026-07-20$30.302025-01-27
2
Gardevoir EX card art
Gardevoir EX#78 · Ultra Rare
−16.7%$6.042026-06-15$5.032025-01-27
3
Talonflame BREAK card art
Talonflame BREAK#21 · Ultra Rare
−16.5%$5.462026-08-01$4.562025-01-27
4
Xerneas BREAK card art
Xerneas BREAK#82 · Ultra Rare
−15.3%$8.622026-06-29$7.292025-01-27
5
M Gardevoir EX card art
M Gardevoir EX#112 · Ultra Rare
−15.0%$66.252025-09-08$56.332025-01-27
6
Hydreigon BREAK card art
Hydreigon BREAK#87 · Ultra Rare
−12.1%$6.672026-07-06$5.862025-01-27

How to read it

Raw is the canonical printing's TCGplayer ask, the same figure the card page shows. PSA 10 and PSA 9 are eBay sold medians verified per listing, printed with their comp counts; a premium is only computed on 5 or more PSA 10 comps.

Gem rates come from the PSA registry snapshot and are only trusted on lines of 100 or more slabs; a zero beside a real population is a provider gap and is withheld, never shown as 0%. Moves and highs come from each product's own recorded series, trimmed at the price-rule change of 2026-09-07, and ignore cards under $5.

Every figure carries its sample. A short series, a thin comp count or a small registry is printed beside the number rather than hidden, and a card that lacks the figure a reading needs is left off that reading instead of scored on a guess.

7
M Gardevoir EX card art
M Gardevoir EX#79 · Ultra Rare
−7.2%$24.652026-07-28$22.842025-01-27
8
Volcanion EX card art
Volcanion EX#115 · Secret Rare
−5.5%$39.892026-06-29$37.712025-01-27
9
Steelix EX card art
Steelix EX#108 · Ultra Rare
−5.4%$19.652026-07-06$18.582025-01-27
10
M Steelix EX card art
M Steelix EX#68 · Ultra Rare
−5.1%$11.722025-09-08$11.142025-01-27
11
Yveltal BREAK card art
Yveltal BREAK#66 · Ultra Rare
−4.8%$8.692026-07-13$8.012025-01-27
12
Pokémon Ranger card art
Pokémon Ranger#113 · Ultra Rare
−3.7%$7.882026-08-25$7.522025-01-27
13
Gardevoir EX card art
Gardevoir EX#111 · Ultra Rare
−3.2%$26.642026-09-07$25.752025-01-27
14
Gardevoir EX card art
Gardevoir EX#116 · Secret Rare
−1.6%$1092026-09-09$1082025-01-27
15
Magearna EX card art
Magearna EX#110 · Ultra Rare
−1.4%$9.402026-08-18$9.272025-01-27