User blog comment:ErdamonPL/Sinitar - the Anti-Mage/@comment-7709681-20130921231358/@comment-7709681-20130921233200

Now that I think of it, what if instead of calliing it "Mana Burn" you call it "Energy Burn":

Against Mana: A percentage of his Maximum Mana as damage.

Against Common Alternative Sources (Health & Energy): A percentage of his Current cost source as damage.*

Against Uncommon Alternative Sources (Fury, Ferocity, Heat): A percentage of their missing cost source as damage.


 * CD dependant champions (Garen, Kat & Riven) are treated as Health casters, hence: the damage dealt is equal to the champion's current health.