Making Thornmail an active Item

I feel like thornmail is just not enjoyable anymore .. i often imagine a thornmail like this : 90 armor 300 hp unique active : (aura for 2 seconds +1 second per 200 armor ; 75 seconds cd; out of combat cooldown recovers 5 times as fast) allied champions within the aura reflect 40% of **your** armor to their attacker when attacked (aura includes you) i think of it as a strategic anti attack tool with a weakness in laningphase and counterplay in teamfights (counterplay being to disengage during its duration and only use spells to reduce selfharming) what do you think ?
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