Booster packs were eight cards, with two Uncommons and six Commons, so it was possible to get a pack were none of your Uncommon cards were equivilent to a real rare card
While being a business-smart limitation for free users, it doesnt feel too much like a hindrance, however, and can be further alleviated by the use of timer consumables. These timer consumables can be collected by completing daily missions, battling, leveling up, or by purchase from the in-game shop
There's nothing worse for a full set collector than passing on a $20 card that ends up skyrocketing, making the set exorbitantly expensive to complete
It was only available inside random booster packs of the S8b VMAX Climax series that was released in Japan, in December, 2021
The big exception was a $5,000 Neutronium pack opened near the end of the stream, which resulted in a $7,000 Rayquaza card