fun idea, but probably wouldn't make it passed development.
What if more items had upgrade paths. Since you introduced the hextech line. (and yes i know this idea would be op on certain champions.
how about some tear of the goddess upgrades
since we already have more... ad for mana ap for mana
maybe one gives more...(obviously not all fo them, but random ideas i already know are going to get shot down)(also maybe put more than one of these on 1 item idk.) MR for mana Hp for mana Armor for mana CDR for mana crit chance for mana crit damage for mana movespeed for mana Attack speed for mana Attack range for mana Hp regen for mana Mana regen for mana (aka the more mana you have the more regen you get)
just random ideas for the fun of the game i like the hextech items and i like item diversity.