One of the key ways in strengthening one's creatures in Pokmon TCG is evolution, which occurs mid-battle, unlike in the video games
In this case you become the new controller of the card, but it is still owned by the player who started with it in their deck (or the player who created it, in the case of a token)
Common Uncommon Rare Super Rare Legendary Enchanted Take a look at the symbol at the bottom of these three character cards from The First Chapter
I will ship as cheaply as possible
Even the slightest dust in the sleeves could be enough to create micro-scratches on your cards during insertion/removal
Its ability looks pretty insignificant at first but combined with certain cards, it can help you produce infinite mana, buff your creatures with a gazillion counters and draw at the same time, or even have infinite turns