Barrier buff Idea

At the moment is outclassed by heal. Heal's permamanent health addition and movement speed boost provides a far safer pick over Barrier's temporary "health addition",

Here I propose a buff to the summoner spell. This idea is only conceptual and can be subject to appropriate change in numbers or duration if it is deemed too strong or somehow too underpowering. Note that number are not definite and only the 'mechanical' workings of the ability is what I emphasise.

To bring Barrier on the game again, Barrier should (overall): • Be able to be casted upon Allies not just on oneself. • Initially provide a shield of 470 points at level 18. Subsequent attacks towards the shielded target will provide (@18) 90 points of shielding per spell/basic attack taken by the shielded target. • The duration of the initial shield should last for 2.5 seconds. • The duration of the subsequent shields will last for 1 second, each shield can stack upon each other.

I'd really like to see what you guys think of Barrier and any other ideas you think would be great to bring Barrier back into the meta. I'd also appreciate what you think of my idea.