They might hold up for a few races, but most certainly not a whole season. I’d ask you - what’s the return on investment? Because it depends a lot on the quality of courses you run (no matter where you are, not all courses are created equal), how good you are, and how much you want to get out of cross country in a given season.
Sure, on a pristine golf-fairway-quality course, dragonflies and the md-x honestly could both make a lot of sense. I think the Dragonfly might have a little more durability than the MD-x, but it’s still very much also a track spike. The question is - do you want to be equipped for the easy running or the hard running. If all your courses are nice - get the MD-X and rip it up. I would caution you with a word of warning, however. Tough courses and tough days are usually when the team aspect of cross country shines through. When your friends learn and are shown that they can rely on you: do you want to be the guy left out crying and moaning about your shoes, or do you want to know that you can deliver when things get hard?
As such, the above commenter is probably right. You’d most likely have a better net outcome if you just invested in dedicated XC spikes.