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Starter Packs traditionally don't have super rare cards. Just a set to get you started.

I haven't seen anything about a limited supply with @SteemMonsters , so they will just price their packs at what the market will pay I guess. A bunch of the cryptokitties type projects including NEO's hashpuppies are running on a more traditional crypto limited supply model. They can just up the percent of common cards in the packs they sell so as to keep the prices more affordable.