Add Adaptive Damage Conversion Of Mana go Non-Mana Champions
If a champion who does not use mana buys a mana item, then grant them adaptive AP or AD based on how much mana they bought. Here’s one possible conversion gain one adaptive ability power for every 20 mana or one adaptive attack damage for every 30 mana. These conversions are easy to remember and almost gold-efficient, incentivizing champions to still build attack damage or ability power basic items rather than mana, while not punishing them for buying more advanced items containing it.
Edit: Please excuse my title typo.
and
only offer a small amount of mana, the drawback of cost effectiveness is minimal. In comparison, while mana users can obviously get all the benefit, its not like they always need that extra chunk of mana. So arguably the cost effectiveness is pretty similar.
For larger mana items like
,
,
, etc, I'm sure the manaless champs are designed to take into account that those items probably won't be used. My only personal gripe is that Abyssal Mask is one of the three tanky MR items (with SV and AH) and without mana you only have the other two to choose from, though thats more of an issue with general selection of choice and lack thereof.