For many players, booster packs alone represent hours of value as they refine decks, test ideas, and search for cards that match their preferred mechanics
Here is the way it works: Discard Energy cards one at a time until you have paid the Retreat Cost (or maybe more)
They're often large creatures that play into green's main themes like ramp, +1/+1 counters, and token generation
But its synergy with other Cats and unique ability makes it a solid staple
On this occasion, the card was offered up to the highest bidder via online auction house Goldin and a Guinness World Records Adjudicator was at the event to ensure the sale had made it the most expensive Pokemon card, and additionally the most expensive trading card at auction
That said, uncommons are often more focused on how they play in Limited - that means Drafts and Sealed, such as the prerelease events that come before a set's full release