See the sample PDF below for samples of what cards you can make. Even better, I've already done the work on over 140 spells and items in the CORE rules and am including them as well. This is a Template for Magic Set Editor that lets you make your own 5th Edition DND cards. The problem is that you need a template specific to 5th edition DND, with the right fields, icons, and backgrounds. There is a FREE program called Magic Set Editor that lets you make your own Magic The Gathering cards. What about items? What if you need several Healing Potions? What if more than one person splashed Bard and you need more than one Cure Wounds card? You can buy pre-made cards, but they aren't cheap and you can't customize them with house rules or make your own special cards for abilities or spells. So what if you have cards for your spells? You could go through your deck (spell list) and select the spells you prepare for the day, with handy information on duration, casting time, effects, and material components.
Spells are one of those things that we have to look up constantly and it slows the game down. From dice to counters to sheets, we as gamers love to have tools and items to help us play more effectively. Physical artifacts are wonderful at the gaming table.