Though beta monsters market is not volatile as cryptocurrencies you can still find good opportunities to trade cards. Sometimes some card prices are down 50-60 % and sometimes they are up 100%.At the moment except legendary summoners almost most of the cards went down at least 10-15% which is a great opportunity for those who wants to buy cards to level them up. Here are some price changes which maybe you will be interested in. After a long time finally Animated Corpse went up 20% and now you can't buy this card at 3 cents anymore. And two best tanks whet down 40-45 percent which are Silvershield Paladin and Haunted Sprit.
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From @smhunter