These Legendary cards - the Zapdos is different from the one you start with if you pick Charmander, by the way - are not unlocked through microtransactions or by spending in-game currency on booster packs with a tiny drop rate, however, theyre just unlocked by battling the Grand Masters
Don't underestimate the potential of iconic Pokmon like a Mewtwo Promo for around $7.56 or a Charizard VSTAR Promo for about $24.53, each having their own unique value in the market
Without the power scaling, Miles is a very average card at best
Polluted Cistern // Dim Oubliette is only okay, I think
The main difference is that, unlike Snappy, you cant cast it in response to something and counter a spell right away
Their high PSA 10 value demonstrates how coveted and valuable they are in the Pokmon collecting world