Like most Pokmon cards, the value of Karrablast depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Brilliant Stars)
Because of the newness of the format, it's really difficult to learn much from these bannings, and things are further complicated by the fact that in the early years of the format, Wizards used a restricted list (much like we have in Vintage today, where you can only play one copy of a restricted card in a deck) alongside the banned list, and while many cards were restricted in the early years (Balance, Fork, Zuran Orb, Black Vise, Land Tax, Hymn to Tourach, and Strip Mine), only two were outright banned
I know @supersaiyanampharos collects them, and has already been able to find quite a few of them over the years
The most expensive card in the Guardians Rising set is Sylveon GX (Rainbow Rare)
But when the battlefield clogs and the skies fill, the ability to take down a massive threat from orbit becomes absolutely crucial, especially in Sealed Deck
You choose which player, planeswalker, or battle the Human is attacking
