User blog comment:Supafrunk/Mana-Regen Based Champion/@comment-3529572-20121024131126

If you want to make a champion mana-regen based, you need to give him an ability, that allows him to regenerate mana (i.e. an ability, which is able to consume huge amounts of mana for a long duration). If you want regen based abilities to work when they actually can't regenerate (i.e. he's at full mana), you should give him something that allows him to use the "over-regenerated" resource. An ability that could solve both problems:

Passive component: he receives an absorb shield based on the mana he regenerated/he couldn't regenerate due to having full mana in the last 2/3/4/5/6 seconds.

Toggle: he starts pulsing, dealing damage/slowing/debuffing/pulling in enemies AND/OR healing/shielding/buffing allies around him. Costs x mana every second.