Magic Resist need more itemization

There are a lot more items to build against physical damage than magic, especially if you want a full tank item and not half-tank, like or . If you want to build full magic resist, against a super AP-heavy team, your build would look like this: or and
Facing a full AD team, and you have way more options. You can build:
Three of those are purely meant for armor and health, and then thorn mail, which has no MR equivalent. Theres only two items that have MR and health in the MR build, and the rest are hybrid offence/defense, or zz'rot portal. I think we need a new MR item. Something with MR and health, or a magic thornmail. Something like:

100 Magic Resist

UNIQUE active: Grants a Black shield (like ) equal to 1.5x your Magic resist. when the shield is reduced by damage, reflects 75% back to the attacker. (The percentage is up for debate)