Decks contain only 20 cards, energy generates automatically once per turn rather than through cards, you only need three points to win (with prize cards removed), benches allow for only three Pokmon, and card mechanics are simpler than modern Pokmon TCG norms
This time, its her normal U rarity Supporter card, but in the Master Ball Mirror variant
The differing pull rate philosophy also impacts card values
Therefore, cards like Professor's Research and Carmine make for great turns when there are Dragon-type cards that you need to discard in your hand
If Grimmsnarl ex, a card that is able to hit for 180 +30, was already a top deck, hitting for 120 + 50 is equally powerful, if not more
While it might be situational, don't be surprised to see some trainers try to find a way to make Umbreon ex work within the competitive Pokmon TCG scene this year