builds nothing but mr on a tank. gets melted in 2 seconds by a ryze. makes fucking sense. just take tank items out of the game if they are useless. their needs to be a thornmail for mr. if you take damage by a spell reflect 100% of the damage or something.
You basically asked for a mage to one shot themselves for attacking you.
Quite honestly, what needs to happen is to have void staff nerfed or removed entirely due to the lack of suitable MR items for every champion. I personally think that adaptive helm needs another defensive passive that instead grows its defence as stacks when taking damage from an enemy, (whether the damage is sourced as ap or not, it will still stack either way).
