One reading note that matters for this rarity more than any other: aggregator "ungraded" prices badly lag this market, because raw Gold Stars trade at a steep counterfeit-risk discount while anything authenticated commands a premium (you'll see PSA 1s outselling raw guide prices below)
PSA operate a ten point grading scale, when a card is sent in to them for evaluation theyll check the cards colouring, corners, edges, centring, authenticity and everything else about it and after that theyll give it a score between 1 and 10, 10 being the best quality card, 1 being the worst quality card
Ill be adding this to a ton of my own decks and I expect many others will be doing the same
Kadabra [Reverse] #64 Pokemon Japanese Scarlet & Violet 151 Keep track of your collection value over time
Expressive Iteration offers some old-school card advantage, which has been sorely lacking over the last five or so years