Its hard to navigate wiki!
Any of the stories give us wild cards to use/disenchant?
Book of heroes and book of mercenaries provide a class pack when you complete a run with a character.
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Look in shop to find solo adventure make sure you have gold to buy them. You will face boss and class challenge all have rewards cards you can play. Some are very good to have early on. Each adventure in these sets will teach anyone about the game mechanics once finish you can keep playing them for fun or for challenge.
Wild format these rewards cards come from. These 5 are the main ones to start out first.