It's interesting to watch the beta card prices because card prices are volatile which is good for card traders. Most overvalued cards right now are legendary summoners and l don't know how long it will continue and even other rare or epic summoner prices went up at least 2-3x from their all low. Here are some important changes in the beta market. Crustacean King went down from 9-10 cents to 7 cents which is good discount, Alric went up again from 80 cents to 85 cents and with this performance l think that rare summoners will worth 1 usd.
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From @smalien