Chalice Items [Mana Font Suggestions]

On a side note before getting into anything, Athene's Unholy Grail should give at least 100% base mana regen.

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NEW Mana Font Passive: Based on spell damage dealt restore 4-8% as Mana based on your missing Mana.*

This suggestion will be for Chalice and Athene's Unholy Grail. I am posting this suggestion as it will offer the items to be high regen items, but in a way that forces interaction, so it does end up being a nerf to passive spells like heals and in sieges where you are constantly missing spells the siege will end really fast due to running out of mana if you don't have blue buff. The most important thing to take away is that it is now active mana regen suppose to passive mana regen which will create more interesting gameplay.

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NEW Mana Font Passive for the chalice bell (Mikael's Crucible): Restores 2.5% maximum Mana per 5 seconds.*

So the chalice bell gets a completely different regen item passive for Mana Font because supports don't deal damage late game and this is a support item. This passive is a lot stronger than Chalice and Grail because it is like buying blue buff but with magic resist and a heal/cleanse active. This approach towards the item was because supports do not get blue buff and with a stronger mana regen might open up some new mana reliant supports come in the bot lane (maybe Anivia support will show up). But mainly because supports do not deal damage so they cannot make use of mana return based on damage dealt.