If the combat isn't turn based, you might need hell of a code(script/plugins) or you can just make it by events(high level of logic and insane amount of patinet are required)
Make stuff like leveling up command card(item) by common event or showing card image in corner of screen is simple but if you want to make combat system to non turn based or want the character move around to attack the enemy, you will need to define many variables such as range of attack, target position, and many more which is pain in the neck if you do that by common event.
As for script/plugin isn't my forte so I couldn't much of a help, for this one you might need to browse or ask people around if you can't make them yourself, I do believe there are many non-turn based combat system script/plugins but you need to either modified it to suit your need(I did this a lot) or combine it with other scripts(beware of comp. problem)
There are many RPG maker tool other than XP, VX, or VXA and their ilk, so when someone say Rpg Maker Tool to me is rather vague... make sure to mention what you're useing to avoid stood-under-miss if you know what I mean.