The PSA 9 Mint is the most documented copy of this card, even being the image on Bulbapedia
If you've previously discarded a Fire Energy, either by getting a Pokemon with a Fire Energy knocked out or as payment for a Retreat, you can use a Flame Patch on a Mega Blaziken ex as it switches in, then attach the free Fire Energy that you get in the same turn so it can attack right away
In fact, it's not even the rarest card in the Team Rocket set
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Personally id love to get my hands on some vintage sealed Korean, Modern packs are fun to crack due to them being super cheap & the cards are beautiful Spoiler - Especially the mirror foils I have noticed Korean is getting more popular over the last couple of years, more and more people importing the product & box openings on YouTube etc