Idea to sharpen (an hopefully make healthier) to 2 tears

First for seraphs instead of a shield why not make the active consume a percent chunk of mana still and give bonus AP equal to a certain percent of the consumed mana for a period of time.

Similar idea for manamune/muramana. Build it out of caufields warhammer and give it some cdr. For Muramana give is a similar idea of consuming a percent chunk of mana to give a temporary AD boost. Losing it's current interaction which frankly is good exclusively for Ez, it will be possible to give a slight buff to it's charge rate, and maybe the passive mana to AD conversion without breaking ez.

For both it allows for it to offer a DFG like boost and playstyle interaction for both AD and AP champs. For the AP option it loses it's ball o' stats feature of offering overly strong offensive and defensive strengths, that work against everyone unlike hourglass for example. For the AD side I would hope it would open it up to allowing champs outside of Ez to build it viably (mana based AD caster/burst champs).