Hmm, a few more ideas.
https://himeworks.com/2013/05/battle-rules/ Battle Rules. It allows you to set up conditions for winning certain card battles. For example, you may have a tutorial battle where you are learning about certain card types and your objective is to use an attack card to finish an enemy off in one turn. It replicates later Yugioh games feature called Duel Trials. You can make condituons that seal certain cards and card types, defeat enemies in x number of turns, with x number of moves/ cards left. Etc. You could also add some bonus challenges that give out bonuses deoending on card combos and actions taken. For example, you pulled off a certain sequence of cards multiple times during the battle or perform x number of fusions or sacrifices.