Reward Cards Market

So volatility is back to the reward cards market and therefore you can make lots of money by buying most used cards and then selling them for profit but it's not a financial and trading is risky. Almost every card prices went up and only few unaffected against the bull market and some reward card prices went up even 300-400%. For example 1 or two months ago after season end Brownie was trading at 20 cents and now it's almost one usd which is 450-500% increase. I myself like brownie because this card helps the team a lot with giving 1+ speed and melee attack to all friendly momsters.