A cool item for Tanks (just hear me out)

Hey guys I have an Idea for an tank item againts mages that have insane poke (eg Veig, Karma etc.) dont really have specific stats but my idea would be a magic resist item that would have have the following passive and active

Passive: {Dont have a name as yet } - grants magic damage reduction based on enemy champion's relative postion (15% @ 650 range i.e max ~ 2% @ 250 range)

           notes [this passive aims to combat poke and not so much to melee champions]

Active: {on enemy champion - absorb 20% of damage taken for that enemy champion for 2 sec. The damage absorbed can be recasted on a enemy champion that does both magic and attack dmg over the course of 3 sec}

           notes [this item overall is prefect for melee tanks that really wants to initiate a team fight with out being poke down] 

tell me what you guys think