Should I sell my old MTG cards?

Hey there, I'm curious about something. I've got a bunch of old Magic: The Gathering cards lying around, and I'm wondering if it's worth selling them. Do you think the market value for these cards has gone up over time, or have they depreciated in worth? Is there a way to tell which ones are the most valuable, and is it worth the effort to try and sell them individually or should I just bundle them together? I'm not really sure what to do with them, so I'm hoping you can offer some insight. Thanks in advance!