[Summoner Spell Concept] Martyr

While I agree we have enough summoner spells for Summoner's Rift and adding new would not be a good idea, the spell could be used in other modes.

So here is my idea.

Name: Martyr Description: Cast on ally, for a duration of 2 seconds, all damage inflicted to the ally will be targeted to you instead. The spell has no effect on crowd controll effects and ends if you die.

Duration is on discussion, maybe could get longer by level like 1.0 - 2.0 at 18.

I imagine such spell could be a good option for a tanky support or champions with invulnerability like Kayle (cast ult on herself, and martyr on adc).