Board Thread:Questions and Answers/@comment-220.255.1.139-20130217053457/@comment-6009285-20130219080652

You should sell cards during the time of the event they're based on and buy cards when it's not their event. As for the regular type cards, just browse the market boards and watch the trend on prices and see if you can find any cheaper ones. If selling, you should find out the average market price and sell for lower than any of the others, but not too much lower or you'll lose out.