Competitive cards tend to fall into one of a few categories: they offer game-changing effects, enable consistent draw/search power, provide strong single-prize or multi-prize value, or have synergy with existing top-tier decks
JPN secondary market prices (altema.jp / SNKRDUNK estimates)
Check out my examinations of the first four sets, Revisiting Commander 2011, Revisiting Commander 2013, Revisiting Commander 2014, and Revisiting Commander 2015
And if you're familiar with Ebay prices, then you would know that the cheapest Shining Latios card is $24, which is $1 from what I quoted before
For a copy of legal reprints look HERE
However, Charizard isn't a Dragon-type Pokmon, and Roaring Moon has only appeared in one game as a version-exclusive Pokmon