Remove Spell Thiefs and Add...
Another support item so that healing and shielding give you gold instead of using abilities to damage. It will make playing enchanters or back lining supports able to actually support. It will remove all of the cancerous mage supports you know and hate today. Spell thiefs is the reason bot lane is really cancer. I would argue that if Riot removed Spell thiefs for a whole year that bot lane would not be such a cluster fuck like it has been for two going on three years now.
Then they could balance mages for the mid lane again like
and much more out of bot lane and leave the tanks and enchanters.
Also remove ranged execute from relic and steel so mages cant abuse that either except for thresh because its a wind up and he is a support by default.