The decks other character, Cruella De Vil, Miserable as Usual, is a much cheaper card able to be played earlier on, and can force characters off the field when shes banished by returning a character to its players hand - playing into the decks more control-like tendencies
While it is possible to spend extra money on extra Pack Hourglasses, additional resources, or cosmetics, its not essential for making progress with the game
Use Marrow-Gnawer's ability to sacrifice one of your rats to make two more 1/1 Rat tokens
Competitive and Historical Significance Cards with ties to tournament decks or memorable moments in Pokmon history often attract players and collectors, which raises demand and prices
Of which, there are a few honourable mentions: A Japanese promotional card from the XY era, this one can be found for around $8,600 when its graded to a PSA 10, although its average price sits around $7,500
This guy performs a couple of roles really rather well and finds play in a variety of decks, all be it mostly blue ones