Final Fantasy has a ton of expensive cards in it, like Iron Giant, The Crystal's Chosen, Coliseum Behemoth, and Ardyn, the Usurper
If one only needs 2 more to win the battle, this will seize the game for them in a way that the opponent cannot counter
However, Wood thought it was "apparent" in this episode that without a traveling partner, "Ash just isn't all that interesting"
As for the shiny Pokmon card itself, Umbreon is an evolution from Eevee and can attack with 30 damage points
but typically a card like that depending on rareness would go for $25 - $100
Cost-reducing and cost-increasing modifiers like Cemetery Prowler or Thalia, Guardian of Thraben are technically different to alternative costs, but follow virtually identical rules for when they do or dont apply, so we can lump them in here too