Intended to help the international game catch up with Japan before the release dates align, Digimon Card Games Release Special Booster 2.5 is a combination of the remaining cards from BT19 Xros Evolution that were not released in the 2.0 booster alongside, as well as all of BT20 Over The X
I dont have an answer to those questions, but iirc @thecharizardauthorty recently briefly mentioned in a video that the inverted WB promos likely came from the sealed promos with the double insert cards (Iron Giant + Catch Mew)
I feel the proliferation after moving the counters makes it difficult to spread shield or flying counters, for example, across multiple units
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Pokemon Center regionals, McDonalds promos, and event-limited items are increasingly tracked by international collectors