New tank item concept Frozen Plate

So i was thinking of a defensive item and i came up with a unique idea

Name of the new armor is Frozen Plate Buildpath requires these items and has a 950 combine cost to form Frozen Plate

Frozen Plate 3600 Gold 600 Health 300 Mana 35 Armor 75% Health regeneration 10% Cooldown reduction

Unique passive: Icy Barrier; Every 50-level seconds forms an icy barrier around the wearer. This barrier blocks 5xlevel + 5% of the users maximum health damage. The cooldown is reduced by 1 second for every 5xlevel + 5% current health damage taken before resistances are applied. Whoever breaks the barrier is dealth half the barriers strenght in magic damage, receives a 30% slow which decays over 1 second and is grounded for the duration of the slow.

The item is 90,14% gold efficient But the passive makes up for not being gold efficient

The passive does a number of things

1. It protects you from damage every so often
2. Punishes the person who breaks the shield with a tiny bit of damage and decaying slow + grounded debuff.
3. The passive scales with levels, meaning it will be more frequent the higher level you are and since it gives a shield it will act as a multiplier for your other tank items
4. The lower you are on health the more frequent the barrier becomes.

The item will turn you into a bit of a hot potato as the barrier pops up quicker the lower you get on health it (not crazy fast though) And then whoever breaks the barrier is hit with a bit of damage and a small amount of cc.