Did I make a mistake? Are there unfair rules? Any suggestions for improvement if there is a next time? Do you want a next time?
All of these subjects, and more, should be discussed here!
Suggestions:
Ability to improve previously learned cards, allowing the ability to take them in their upgraded form.
You don't start with rare cards, you have to learn them.
Rebalance the 0-0 points and the bye points.
Prevent redundant fights.
Add relic's to decks that forgot to earn a card
Allow users to learn two cards in a round if they forgot last round.