first edition entei pokemon card (1/17) [POP Series 2] Moderately Played Rare Retreat cost Entei - SV03: Obsidian Flames

That's good old Boba Fett for you

When trading with someone you don't know well, always use the game's built-in "Make an Exchange!" security feature

Now, Flesh and Blood sees play at over 3000 stores worldwide and has organized play events ranging from local weekly meetups to professional events with prize pools up to $100,000

And in terms of which Pokmon cards are the most desirable, its hard to argue against Charizard

Its not an especially easy card to find, and both that scarcity and its powerful ability has seen its current average selling price reach significantly less than $10,000, but $800 is certainly not a low value