Starting with Dominaria back in 2018 and the release of sagas, the one-drop has been bought out and seen a massive price spike five or six times, although after a few weeks it trends back down, but never all the way back to its pre-buyout low
On the flip slide, a promo card that comes exclusively with a movie ticket to a Pokmon movie might be worth a lot more, as you would have actually had to buy the movie ticket at the time to see it, and since movies usually arent in theatres that long, the chance will pass by quickly
The illustration shows the two original White Dragons and A-White Dragons charging their Burst/Burn Streams
The Pokemon you got is placed face up in front of that player (at the bench position in a normal Pokemon card game)
The effect depends on the item, but examples include searching your deck for a specific card - as with the Pok Ball item - or healing damage from your Pokmon, as with a potion