Now you can buy cards at super cheap price because of the season ending. Every time season ending happens most people dump their reward cards on the market to make money. Because of the huge supply of reward cards sellers becomes more than buyers which cause price fall. I love season endings because l can buy my favorite cards at cheap price. Even you can buy some common cards at 1 cent which is the cheapest price. Though I don't advice trading these cards but who knows maybe you can make a lot of money by buying cheap cards with the hope of selling for higher prices.
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From @smalien