To tell if a Pokmon card is worth money, you should check the set symbol, rarity icon, and condition
Special Summon itself from your hand
Commander is a format all about cheating creatures into play: reanimate them with Animate Dead effects, cheat them into play from your hand with Kaalia of the Vast or from your opponent's deck with Bribery, yoink them from your library with Tooth and Nail, blink them with Brago, King Eternal the list goes on and on
Do this as many times as needed(at least twice recommended, but three is best)
For example, Suicune Gold Stars Cross Wind attack costs three Water energy cards and reads, If you have less Prize cards left than your opponent, discard all Energy cards attached to all of your Pokmon. Entei Gold Star and Raikou Gold Star have attacks that have similar effects, discouraging collectors from using them in gameplay
Because Sparkling Pokemon cards are powerful compared to other 1-Prize Pokemon cards, players can only have a single Sparkling Pokemon card in their deck at one time