Challengers are competing for the Aetherspark which bestows massive power on whoever wields it
Just between us, there is a little rule that states that flavor text has no rules relevance
Known as power creep, its a way of making older cards outdated in the hope that players continue to purchase new products, though it can be frustrating when more casual players want to continue making use of their existing card collections
Otherwise, see all the discounts on Pokemon TCG, or every big offer on Magic The Gathering at Best Buy here
You need to be brave if you want to sleeve up a promo copy though
The only way I can think of this working is you mailing this card to your opponent, putting the duel on pause until they receive the card, and then start again once they have it