Well the energy steal unit wouldnt be 42 for sure if it was about to drain energy, maybe a lower one (for sure a lower one lol). Maybe they could change the mechanic of the item as a whole, example Unique Passive: Targets being hit by your auto attacks get their mana or energy regeneration reduced to zero for 1 second (maybe 1.5 or whatever, that would be up to test realms to decide). And if u think that the change is too drastic...well, last time i saw it being used is like 2008 before christ. Especially since the last 5 heroes released aint mana users except for Ezra (master, blondie of demacia, naruto and his boyfriend, are these all?).