But also, a nice control card
They feature a subtle D&D ampersand logo layered in the foiling across the entire card
Not only that, but its in-game legality didn't raise concerns, and the fact that it was very expensive was fine considering this and also the fact that it was a premium set, meaning it had very strong and valuable cards that in turn increased the value of each pack
It was created as part of a CoroCoro magazine promotion to celebrate the launch of Pokmon Snap in 1999
Most obviously, you can use Powerstones to cast artifact spells, like the retro version of Scrap Trawler from the Brothers War bonus sheet, which reads, Whenever Scrap Trawler or another artifact you control is put into a graveyard from the battlefield, return to your hand target artifact card in your graveyard with lesser mana value. Wait, lesser mana valuelesser mana value than WHAT
The first are Landers, which had a huge presence in the set and are likely going to become just as ubiquitous as Food