A 2-mana 2/3 attacks reliably, and drawing even just one Plains makes it way above average
Typically, grading companies use a scale from 1-10 to determine the condition of your cards, with a grade of 10 , or gem mint, being the best condition your card can be in
As your first main phase begins during each of your turns, you add a lore counter to each Saga you control, including the Saga creatures
As the Water-type Gym Leader, getting a card with Gyarados was the pinnacle of pairings based on the available options during the time, so it's no surprise to see this as one of the most valuable Gyarados cards
That cross-generational appeal, combined with the fact that this is one of the more visually striking Galarian Gallery cards in the set, gives Mewtwo VSTAR a staying power that most modern cards cannot match
A local shop counter conversation often makes this clear fast