Buffing Athene's - The Blood Grail

Preface: This is written in the assumption that Athene's is still too weak and could use a buff, so take it with some grain of salt (not saltiness, please - I am actually glad that item's dominance over midlane was broken).

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Ok, what would I propose as a buff for that item?

Simple: Play on the theme of Blood Grail that the item possesses, and add an active effect to it. Something like one of the following:

• Sacrifices 10% of your max HP to regain X mana (scaling with level, maybe? Or scaling with the amount of HP sacrificed?) over the next Y seconds. (Max HP to make you back at low mana + low HP).
• Cast the next spell in the next 5 seconds at double the mana cost in HP. Emergency OOM but high HP cast. Plus, decision making: Do I want to get the kill and possibly get killed by the tower on the way out by squeezing that one extra spell in?

Essentially, something that allows for casting at the cost of your life force.