There are a lot of cards which is way more inferior to others .. I can understand your idea these cards are easily attainable so that can upgrade to compare with others but if I choose invest in particular cards, others become redundtant .
I want to add the recycle option ... So players can choose between sacrificicing all the lower cards to have more material buying new ones or keeping it to wait for a new level
 "Creature Card Idle"){kind=icon}