Is a Terastal Festival ex box (Japanese Prismatic Evolutions) worth opening?

Terastal Festival ex (SV8a) is the Japanese version of Prismatic Evolutions: the Eevee set from December 2024. Amounts: ungraded, PriceCharting, 13 November 2026.

What's in a box

• 10 packs of 10 cards
• Usually 1 Special Art Rare (out of 33) and 1 ACE SPEC
• About 1 Master Ball card per 2 boxes, out of 101
• Super Rare in about 1 in 5 boxes, Ultra Rare in about 1 in 15; a God Pack an estimated 1 in 300 to 500 boxes

The most expensive cards

• Umbreon ex SAR (#217): about €240
• Sylveon ex SAR (#212): about €96
• Leafeon, Espeon, Glaceon and Vaporeon ex SAR: €46 to €52
• Umbreon Master Ball (#092): about €45
• Flareon and Jolteon ex SAR, Pikachu ex UR (#236): €36 to €41

Is opening worth it?

Counting only these ten cards (value times odds), the expected value is about €19 per box, against €125.95 for a box with us (24 in stock, 14 November 2026). That is a lower bound: the other 25 SARs, the ACE SPECs and the other Master Balls are not included. You open Terastal Festival for the Eevee SARs and the shot at Umbreon, not to make a profit. For comparison: the English Umbreon ex SAR is worth about €880, almost four times the Japanese one.