There are many factors affecting the value and rarity of Pokemon cards, such as the set, edition, condition, grade, print run, and overall demand the last of which is the most difficult to determine
Its an important distinction to make, because if a mechanic is not inherently broken in all cases (and very few are) then you can make the case for a new set figuring out how to implement them in a way which avoids the pitfalls of previous overpowered designs
I dont plan to change my ways
As for what The Aetherspark can actually do, its basic mode is equipping a creature and giving them a +1/+1 counter - nothing too absurd about that
Afterwards she developed a desire to shine rather than endure in life, a desire that grows stronger after she learns of Princess G's firing
send this card from your hand to the Graveyard