To determine the exact value, you should consider the card's condition, rarity, and demand
Most valuable Black Bolt and White Flare Pokmon cards Black Bolt and White Flare are massive sets, especially with every Pokmon joining in from Unova and every one having it's own Illustration Rare or Secret Art Rare
Since then weve also seen Destiny HEROs, Masked HEROs, Evil HEROs, Vision HEROs, and Xtra HEROs all of which have made the HERO card pool very diverse and powerful
Still, the cost in terms of occupied sideboard slots is big and I recommend going for Ancient Grudge + Stomping Ground only if you expect to see a lot of artifact decks, mainly Hammer it should give you a lot of percentage points in the matchup
It also pairs nicely with Altar of Dementia
There is also a problem with balancing, so the difference in difficulty depending on the match is too large, or there is no waiting time that does not take a battle, such as a kind of invincibility time immediately after battle, so the first attack[27] In the monster area, there is even a self-hell mode where you can be attacked almost immediately after finishing the battle, so the feeling of difficulty is even higher