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Graded Population Report: Pikachu [Holo] #25 Visualize the distrbution of grades in the chart

Tricky Gym also explains that Blacephalons GX ability also allows it to manipulate Prize trades, one of the most important facets of the Pokmon TCG

As more cards are released with every set the developers put out, more straws are added to the back of the metaphorical camel that is the games balance

That said, fast mana tends to offer fixing as well, so its not unreasonable to try him out

Other cards like Serra Angel itself or cards with similar effects may be more efficient choices for a deck looking to maximize its effectiveness