So now with the newest addition of cards that you can obtain through Rewards, the amount of Power that each card provides has been tuned down. If you are able to see, you will realise that the amount of power each card provides for it's respective rarity tier is decreasing. This really puts early adopters in a much favourable position.
Also, this really got me wondering. So, what happens after more expansions are introduced? Will they continue to decrease the Power? Probably eventually we might even have 1 common card to provide 1 power, and this will really discourage new players to join in, which will further hurt the economy!
I enjoy the game, but I am concern about the outlook.
Credits to 
@draicor/splinterlands-updated-cards-power-chart-dec-burning