Let us buy any card, anytime with $$$

All this chasing of cards is just tedious, please, let every card in the game be available for purchase anytime with cash.
Price them according to their rarity with Mythics $20, Legendaries $15, Rare $10, Uncommon $5 and Common $2.
But you get the idea.
Think of the money you'll make... because some people love collecting cards.