This is by far my favorite track from the Megaman Zero series. It doesn't surprise me that someone would choose to do a remix on this one. Excellent remix. If you liked this, there's another arrangement of it on the Onimusha Buraiden OST.
This remix is the first FF6 remix I've heard in a long time that I've really enjoyed. The repetition got me curious, and the different instruments (and implementation of said instruments) compliment each other nicely. Very cool.