Is the The Underworld of Secrets booster box worth it?
Average — depends on luck
The booster box costs €71.72 today (Cardmarket trend). 9 cards are worth €5 or more — €116.72 together, 1.63× the box price. The top five cards make up 53% 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 |  Ki Lua, Fossil Girl of Melted Ice TUS-070 RR | The Underworld of Secrets | €50.00 | 0% |
| 2 |  Reinhardt, Descendant of the Ethereal King TUS-078 RR | The Underworld of Secrets | €11.69 | 0% |
| 3 |  Neun TUS-095 RR | The Underworld of Secrets | €10.89 | +15% |
| 4 |  Sechs TUS-099 RR | The Underworld of Secrets | €10.45 | 0% |
| 5 |  Rocket Dive // Pink Spider | The Underworld of Secrets | €8.41 | -10% |
| 6 |  Divine Lightning // Predator | The Underworld of Secrets | €7.45 | -32% |
| 7 |  Grandleon, Strongest Ancient | The Underworld of Secrets | €6.12 | +54% |
| 8 |  Refrain, Resident of Wanderers' Castle TUS-008 RR | The Underworld of Secrets | €5.91 | +2% |
| 9 |  Reflect, Resident of Wanderers' Castle TUS-044 RR | The Underworld of Secrets | €5.80 | +2% |
| 10 |  Dexia, Ethereal Twin Prince | The Underworld of Secrets | €4.81 | +5% |
| 11 |  Rusty, Phantom Ninja Genius | The Underworld of Secrets | €4.73 | +6% |
| 12 |  Secret Stone of the Cat Moon TUS-103 R | The Underworld of Secrets | €3.76 | +104% |
| 13 |  Child of Crimson Wind TUS-036 RR | The Underworld of Secrets | €2.88 | 0% |
| 14 |  Child of the Ethereal Moon TUS-025 RR | The Underworld of Secrets | €2.55 | +16% |
| 15 |  Hyde, Solitary Assassin | The Underworld of Secrets | €2.50 | -23% |
| 16 |  Metamorphosis // Dendrobium | The Underworld of Secrets | €2.43 | -35% |
| 17 |  Secret Stone of the Wanderer Moon TUS-107 R | The Underworld of Secrets | €2.28 | 0% |
| 18 |  Complete Rejection of the Wanderer Twins | The Underworld of Secrets | €2.24 | -31% |
| 19 |  Ancient Weapon Fragment | The Underworld of Secrets | €2.00 | -38% |
| 20 |  Dexia's Advice | The Underworld of Secrets | €1.82 | +10% |
Prices: Cardmarket trend, updated daily — as of Oct 30, 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.