Tank item for AP Champions idea

This is Ability Power item idea for AP tanks that scales well with Health giving them Edge of Survivability

**Undying Heart **2900 g = 40 Ability Power 600 Health 10% cooldown reduction Unique: 4% bonus health into Ability Power **Unique - Cooldown 12 .. 4 seconds: Damaging enemy champions with an ability will cause them to take 15% your bonus health as magic damage over 3 seconds while your champion will restore 15% missing health instantly.

If Scepter is about to become health-less then this item would be good addition as its focused on and scales with max health for champions who desire to build more protection and less AP and will be very appealing for Vladimir Sejuani Gragas Maokai and other alike

I think there are more Health options for AD champion and much less for AP Tanks. Frozen Mallet gives tons of health Titanic Hydra scales health they are obvious tank oriented

Rylai and also gives good amount of health but Rylai may become health-less at the same time Vlad could lose quite amount of power and he does not care about mana. There are also other tank champion that don't have huge mana issues too and they need extra boost to their defenses. For instance you may be Galio and RoA would solve all your mana issues and now you seek way to boost other stats

So i think this item would be good replacement or addition as its focus primary on tanks