A simple idea about Thornmail.

How about we give it the treatment? Just like it was decided that 's regen passive must come at a price, high enough hp, the same philosophy could be applied to . Make it so that after a champion has amassed enough armor, he/she receives an empowered version of its passive, something with more magic damage dealt back or AA damage reduction or even grevious wounds to the attacker. That, along with the appropriate price increase, would make this item far more valuable in a build and bring it back in the game as an anti-AA heavy team.