If the idea is to get even more packs to keep on collecting cards or to find some of the rarest ones, its much more effective to use the Pack Hourglasses to reduce the waiting time and get new packs immediately
Features Chinese-exclusive artwork and card finishes
You can see all of the Pokmon Sets and their symbols here: Pokmon Sets For the older cards, the set symbol is on the right half of the card, just below the Pokmon picture
The new Pokmon TCG Pocket game combines all those ideas in a free Smartphone app that kids today can carry in their back pocket wherever they go
Ureni, the Song Unending and The Ur-Dragon ar some of our biggest Dragons, but almost most of our Dreagons can act as finishers as they all have high stats and Flying which is a form of Evasion
So, maybe some of the weights also apply to non-English packs, but I definitely would operate under the assumption that they dont