A quick update just in case someone wanders in here and looks for something like this.
I had some spare time on my hands so I wrote a simple script that checks your deck for rotation and performs a general validation as well. This is just a fun hobby project but it it's pretty well tested and working.
It reads a deck file exported from MTGO /similar and interfaces with magicthegathering.io and whatsinstandard.com automatically for card information.
You can find it (including the source) here: https://github.com/JesperLarsson/pyMTGDeckCheck
Note that it does require you to install python to run it, but it shouldn't be too hard as the rest of the setup should be automatic and I wrote some basic instructions. I hope that at least it could be helpful for someone just getting into programming as a fun small program.