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Panama said:
JWeinCom said:

You get two orbs for each day you play, and some for missions.  So not finite, but really scarce.

Well if you can get 20 crystals a month it aint so bad then considering you can grind your units into 5 stars. 

Grinding them up requires combining them with the same hero which uses crystals.  Crystals are also necessary to upgrade your castle, upgrade your barracks, and other things.  So, it kind of sucks.  Especially considering the price of crystals is kind of ridiculous.