Now you can see that the Mint repo has higher priority (700) than Sid (500). That's because LMDE, unlike pure Debian, makes use of /etc/apt/preferences file where the repo priorities are set. If you look there, you can see the Mint repo's priority. As for Sid, it just has its default priority, that's 500.
All that stuff prevents you from getting newer Cinnamon and libmuffin. You can use
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sudo apt-get -t unstable cinnamon libmuffin0
to get them. The "-t unstable" option tells apt to use that repo.
I also suggest reading more about preferences:
The last link shows how you can keep unstable and experimental in your repos list (no need to comment them anymore)
and keep their packages from being automatically installed during dist-upgrade (or mintUpdate use).
Final note:
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# deb http://debian.linuxmint.com/latest/multimedia testing main non-free
deb http://www.deb-multimedia.org sid main non-free
You should've had a very good reason to disable the "native" LMDE repo and enable Sid's repo instead. I suggest reverting that before you get any unwanted upgrades and breakages.