18 pack booster box Pokemon TCG Mega Evolution Perfect Order Packs and many others Pokemon TCG: Stellar Crown -

Featuring a 1st Edition PSA 10 population of only 87 copies, this card has a reasonable degree of difficulty to acquire

But the main big mechanic of the set is Prototype, which allows players to cast cards paying a lower alternative cost

Magic R&D

In Revised, Magic was released in German, French and Italian, so there is Revised black border in those languages because they are "unpublished" cards and only white border in English, precisely the purpose of the company's printing policy

Pokemon 151 Comparing the Japanese Pokemon card prices against the Korean and English ones, it is clear that the (English) Charizard ex SIR PSA 10 is the most expensive