Spellbook Cards from Gale Force Nine WILL change your life.
I'm the kind of player who gets flustered when the GM or another player questions whether my spell works the way I think it does. The character sheet doesn't leave you enough room to write down every aspect of the spell and I don't like to grind combat or role play to a halt. I want to do something cool/useful, describe it in the most extra way possible and move on. The more time that passes while I'm flipping through the Players Hand Book and Xanathar's Guide to Everything, the more my soul is slowly crushed and I question my life choices.
Does that spell require concentration? What's the exact range? Is there a duration? What type of saving through does the DM need to make? What is the flavor text on Blight? These are ALL questions that can be answered in the palm of your hand with Spellbook Cards from Gale Force Nine. They come in packs specific to you class, meaning you don't have to weed through every option to even search the things available to you. There are even cards for martial classes and racial abilities if you want to make sure you have everything covered.
I recommend this tool especially if you're playing a Cleric, Paladin, Druid, or Wizard who needs to quickly adjust their spell list every long rest. These cards help you eek out every opportunity for customization and preparation that your class offers without interrupting the fun of the game for your friends at the table. Look for them at your FLGS and don't pass them up!