Prices are updated based upon Pokemon World Championships 2014 listings that sold on eBay and other marketplaces
Given the sheer density of commons and uncommons, you've likely gotten several through natural accumulation over time, and that's to say nothing of how many come in the packs themselves
From 0:06 in the video, you can see a woman playing with Pokmon cards, and a father and son from 0:18, and at 0:46 you can see a large-scale Pokmon card championship with elementary school students competing against one another
However, almost every deck follows the pattern of having mostly 2- and 3-cost cards and very few cards that cost 6 mana or more
As long as everyone agrees, it usually isnt a problem
Cards exiled by The Heron Moon's second ability are exiled face up