A new Amumu passive

Im not sure if this is the right place to put this but here it goes. Btw english is not my nationality so dont kill be for spelling things wrong :)

So you may or may not know about amumu's passive. It's called "Cursed Touch" and what it does is that is auto attacks apply a debuff that reduces the enemy's magic resist by a flat amount for 3 seconds. It's a pretty underwelming ability just by that. It can help with his jungle clears by a little and nothing much. In team fights, sadly, he can only apply this to 1 person when he has 3 skills that are AoE. And the worst part his, there is another passive in the game that does what Cursed Touch does, but better! [Wich is Fiddle's passive (and honeslty its a bad passive too but that's another story)]

And the reason why I am saying this it's because I have a simple concept for a new amumu passive that I would like to hear other people's opinion on:

It is called Friendship

In a range of about amumu's ult (or slightly bigger), when an ally is near amumu, he would get 5% increased armor and mr (it would stack)

The number could be a bit too high, but I think this would make more sense on amumu than its current "Non Existent" passive, and it could also make him more viable