How does this item sound? (Unique Active: Runic Repulsion)

Runic Necktie (I don't know I want a tie item xD)

2700 gold +50 Armor +50 Magic Resist +300 Health

Unique Active (90 second cooldown) Runic repulsion: On active, any damage done to your champion for 3 seconds is taken at 75% of the actual value to yourself and spread around you in a circle as magic damage done at 25% of the actual value. This damage is universal and can damage monsters, minions, allies, and enemies.

The circle would be about the range of a Kha'Zix Q. So lets say you are being ulted by Syndra, and activate Runic repulsion. You will only take 75% of the damage it would have been, and anyone in your radius will take the other 25%.

Thoughts? I thought it would be kind of cool to be able to repel damage, so it might be useful for engage tanks who want to be able to dive into a group and be able to soak and deflect a bulk of damage.