Thanks for your inquiry! As of v.1.2.0 of the Card Game Combat plugin, you can do this using the Require keyword in the Card Passives notetag. Here's an example of one such requirement below:
This Card can be in a Deck but can't be played until the Require conditions are met. This keyword makes the check whenever the player attempts to play the card so if something changes during battle it may be possible to play this Card at a later point. If you want to go the extra step to hide the Card in the Deck if the user doesn't meet the requirement, you will need to set up either a Troop or Common Event to remove or include cards based on Card requirements at the start of battle. We can look into offering a keyword or plugin parameter that does this automatically in the future if there is demand for it.
Hope that helps. Let us know if you have more questions :)
Thank you very much. It was very helpful. This is a good plugin. I know it is a lot of work to develop it, but I support it.
