User blog comment:Willbachbakal/(Item Concept) Fixing Mana/@comment-973379-20151210172800/@comment-1330314-20151210195022

The issue with Seraph's and Muramana is that neither effect really adds that much gameplay to mana. The consequence of using their effects is that you either have so much mana that they're just near-free extra power, and so are unrelated to mana usage, or you don't and you end up damaging your own standard ability use for something designed to empower it. In either case, there isn't really rich or nuanced gameplay to be had, and I think either effect could be just as interesting even if they didn't depend on mana.