Spelldocs in play card combos
Someone told me recently, why not allow magic during the play card battles to "make it a real magic duel". And they are right.. but not the chat magic, that would have no effect on battles, at least not realtime. Instead, creating card combos based on spelldocs, thats an option. Discovering such combos will also reveal missing spelldoc levels! Not to mention they are actually interesting to see used in a fight, or see what effect come out of these spelldoc combos, when they are applied in reverse..hmm.. :D

Some are already in, more are implemented right now.