I must confess that I never saw this anime, this one was famous when there were also others in very good times and maybe that's why I didn't take enough interest in it, but I know it has a pretty big fandom, which for sure makes it very good.
The power system, as you say, is one of the things that catches my attention the most, I think it's quite logical and balanced.
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gooo and watch it! i bet you will definitely like it!
the animation is still greater than most of the anime that currently air!