OFFICIAL Thai SV8a T Terastal Festival ex

Japanese SV8a Terastal Festival ex
Trivia:
A Japanese high class booster box is a box of Pokémon booster packs that contains more cards than a regular booster pack, and may also include special god packs: 
Number of cards

Each booster pack in a Japanese high class booster box contains more cards than a regular booster pack. 

Guaranteed pull rates
Japanese high class booster boxes may have guaranteed pull rates. 

Special god packs
Japanese high class booster boxes may include special god packs that only contain rare and ultra-rare cards. 

New and exciting art
Japanese high class booster boxes may feature Pokémon in new and exciting art. 

Reprinted cards
Japanese high class booster boxes may include reprinted cards that are competitively used. 

New Pokémon and supporter cards
Japanese high class booster boxes may introduce new Pokémon and supporter cards. 

Some examples of Japanese high class booster boxes include:

Pokémon High Class Pack VSTAR Universe

A final special expansion to the Sword & Shield Series of the Pokémon Trading Card Game 

Shiny Treasure ex (SV4a)
A high-class set that includes over 150 secret rares, many of which are shiny 

SV8a Scarlet & Violet Terastal Festival
A set that includes numerous reprinted and competitively used cards featuring new and old artwork 

Set Size Summary - 50 cards:

12 SR Supporter cards
33 SAR Cards
26 ex cards 
6 Supporter cards
5 UR Gold ex cards
 

God packs return
Pack patterns so far:

6 poke ball reverse + 3 SAR eeveelution
All 9 eeveelution in 1 pack
There might be more, we still are investigating this.
 

Set/Box structure contents (thanks koala):

1 SAR card is guaranteed per box.
It’s possible to get 1 SAR & 1 SR in a box.
It’s possible to get 1 SAR & 1 UR in a box.
3 Mirror foil cards are guaranteed per box.
Master Ball mirror foils are not guaranteed in a box, instead you may get 3 Poké Ball mirror foils.
A "Master Ball Mirror" card refers to a Pokémon trading card with a special foil pattern that mimics the design of a Master Ball (the most powerful Poké Ball in the Pokémon universe), making it a rarer and more valuable card compared to a "Monster Ball Mirror" card, which would simply feature the standard Poké Ball design on its foil pattern; essentially, a Master Ball Mirror card is a specific type of rare foil card featuring the Master Ball design, while a Monster Ball Mirror card is a less rare foil with a regular Poké Ball design. 

To differentiate between a "Master Ball Mirror" and a "Monster Ball Mirror" card, look for the distinct design on the ball itself: a Master Ball Mirror will feature the recognizable "M" symbol on the ball, while a Monster Ball Mirror will simply display a standard Poké Ball design, as "Monster Ball" is the Japanese term for a regular Poké Ball; essentially, the Master Ball is the key identifier to distinguish between the two.

Key points to remember:

Rarity:
Master Ball Mirror cards are generally much rarer than Monster Ball Mirror cards due to their unique design based on the Master Ball.

Appearance:
Both types of cards would have a mirror foil effect, but the pattern on the foil would differ, with a Master Ball Mirror featuring the distinct Master Ball design.

Value:
In the Pokémon card collecting community, Master Ball Mirror cards are usually considered more valuable because of their rarity and unique design.