Many 60-card aggro decks have 21 mana sources, and for good reason
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That said, these are all good prices given what the collection includes
Light Arcanine sticks out as the most iconic Light Pokemon, given how few other distinct artworks this Pokemon is featured in
However, [casthaven]Razorverge Thicket[/casthaven] is still a card that sees play in multiple archetypes in Modern and since many other fast-lands are trending upward, see [casthaven]Blackcleave Cliffs[/casthaven], I think this card could return to the $7-8 range come Modern season
At that time, they added an illustration of a unicorn to the back of the cards to distinguish between cards used in the tournament and those that were not