I think D ring...

You should remove the passive mana regen still,but keep the mana refund on kill and add the +5 damage. Keeping your mana pool up requires you to last hit, hence why low elo players complain about it since they physically can't last hit. Let the mana changes go through for the champs to give them the extra mana regen, but Don't make it a braindead item, make mages having to last hit to gain their mana back, currently it shows some sort of skill expression, don't try and remove things that punish bad players/reward good ones