Is the Steam Siege booster box worth it?
Cheaper to buy singles
The booster box costs €1,584.19 today (Cardmarket trend). 10 cards are worth €5 or more — €351.19 together, 0.22× the box price. The top five cards make up 65% of the whole set’s value.
How cards are priced
Most cards in any set are commons worth cents. Whether a box pays off depends on hitting one of the few top cards.
Most valuable cards in the set
Full set →| # | Card | Set | Price today | 30 days |
|---|---|---|---|---|
| 1 |  Gardevoir EX 116/114 | Steam Siege | €165.83 | +24% |
| 2 |  Gardevoir EX 111/114 | Steam Siege | €40.10 | -11% |
| 3 |  Volcanion EX 115/114 | Steam Siege | €35.87 | -38% |
| 4 |  Steelix EX 108/114 | Steam Siege | €34.90 | -7% |
| 5 |  Volcanion EX 107/114 | Steam Siege | €22.89 | -10% |
| 6 |  Volcanion EX 26/114 | Steam Siege | €14.71 | +53% |
| 7 |  Magearna EX 110/114 | Steam Siege | €11.09 | +8% |
| 8 |  Professor Sycamore 114/114 | Steam Siege | €10.41 | -5% |
| 9 |  Pokémon Ranger 113/114 | Steam Siege | €9.83 | +10% |
| 10 |  Yveltal 65/114 | Steam Siege | €8.15 | -4% |
| 11 |  Yveltal BREAK 66/114 | Steam Siege | €8.15 | -4% |
| 12 |  Clawitzer 34/114 | Steam Siege | €8.00 | +69% |
| 13 |  Clawitzer BREAK 35/114 | Steam Siege | €8.00 | +69% |
| 14 |  Xerneas 81/114 | Steam Siege | €7.58 | +1% |
| 15 |  Xerneas BREAK 82/114 | Steam Siege | €7.58 | +1% |
| 16 |  Talonflame BREAK 21/114 | Steam Siege | €5.56 | +10% |
| 17 |  Hydreigon 86/114 | Steam Siege | €4.82 | -4% |
| 18 |  Hydreigon BREAK 87/114 | Steam Siege | €4.82 | -4% |
| 19 |  Gardevoir EX 78/114 | Steam Siege | €4.47 | 0% |
| 20 |  Yanmega BREAK 8/114 | Steam Siege | €4.46 | +1% |
Prices: Cardmarket trend, updated daily — as of Oct 29, 2026.
How to read these numbers
The full-set value is what all cards would cost as singles. One box won’t complete the set and the rarest cards are rare, so we focus on cards from €5. If they are worth many times the box price, the set is rich in valuable cards; if value is concentrated in a few cards (high top-5 share), opening is a lottery.
If you want a specific card, buying it as a single is almost always cheaper. A box makes sense if you enjoy opening, play limited/draft or collect sealed product.